<?xml version="1.0" encoding="UTF-8"?>
<QALCULATE version="2.4.0">
  <category>
    <title>Small Numbers</title>
    <title xml:lang="nl">Kleine getallen</title>
    <title xml:lang="sv">Små tal</title>
    <title xml:lang="zh_CN">小数字</title>
    <builtin_variable name="permille">
      <title>Per Mille</title>
      <title xml:lang="nl">Per mille</title>
      <title xml:lang="sv">Promille</title>
      <title xml:lang="zh_CN">千分之一</title>
      <names>r:permille,au:&#x2030;</names>
      <names xml:lang="fr">pourmille,au:&#x2030;</names>
      <names xml:lang="sv">promille,au:&#x2030;</names>
    </builtin_variable>
    <builtin_variable name="permyriad">
      <title>Per Myriad</title>
      <title xml:lang="nl">Per myriad</title>
      <title xml:lang="sv">Permyriad</title>
      <title xml:lang="zh_CN">万分之一</title>
      <names>r:permyriad,au:&#x2031;</names>
    </builtin_variable>
    <builtin_variable name="%">
      <title>Percent</title>
      <title xml:lang="nl">Procent</title>
      <title xml:lang="sv">Procent</title>
      <title xml:lang="zh_CN">百分位数</title>
      <names>a:%,r:percent</names>
      <names xml:lang="fr">a:%,pourcent</names>
      <names xml:lang="sv">a:%,r:procent</names>
    </builtin_variable>
  </category>
  <category>
    <title>Large Numbers</title>
    <title xml:lang="fr">Grands Nombres</title>
    <title xml:lang="nl">Grote getallen</title>
    <title xml:lang="sv">Stora tal</title>
    <title xml:lang="zh_CN">大数</title>
    <variable>
      <title>Googolplex</title>
      <title xml:lang="nl">Googolplex</title>
      <names>r:googolplex</names>
      <value>10^(10^100)</value>
    </variable>
    <variable>
      <title>Googol</title>
      <title xml:lang="nl">Googol</title>
      <title xml:lang="zh_CN">大数</title>
      <names>r:googol</names>
      <value>10^100</value>
    </variable>
    <variable require_translation="true">
      <title>Centillion</title>
      <title xml:lang="nl">Quinquagintiljard</title>
      <title xml:lang="zh_CN">百万的一百次方</title>
      <names>-r:centillion</names>
      <names xml:lang="nl">quinquagintiljard</names>
      <value>1E303</value>
    </variable>
    <variable require_translation="true">
      <title>Vigintillion</title>
      <title xml:lang="nl">Deciljard</title>
      <title xml:lang="sv">Deciljard</title>
      <names>-r:vigintillion</names>
      <names xml:lang="nl">deciljard</names>
      <names xml:lang="sv">deciljard,p:deciljarder</names>
      <value>1E63</value>
    </variable>
    <variable require_translation="true">
      <title>Novemdecillion</title>
      <title xml:lang="nl">deciljoen</title>
      <title xml:lang="sv">Deciljon</title>
      <names>-r:novemdecillion</names>
      <names xml:lang="nl">deciljoen</names>
      <names xml:lang="sv">deciljon,p:deciljoner</names>
      <value>1E60</value>
    </variable>
    <variable require_translation="true">
      <title>Octodecillion</title>
      <title xml:lang="nl">Noniljard</title>
      <title xml:lang="sv">Noniljard</title>
      <names>-r:octodecillion</names>
      <names xml:lang="nl">noniljard</names>
      <names xml:lang="sv">noniljard,p:noniljarder</names>
      <value>1E57</value>
    </variable>
    <variable require_translation="true">
      <title>Septendecillion</title>
      <title xml:lang="nl">Noniljoen</title>
      <title xml:lang="sv">Noniljon</title>
      <names>-r:septendecillion</names>
      <names xml:lang="nl">noniljoen</names>
      <names xml:lang="sv">noniljon,p:noniljoner</names>
      <value>1E54</value>
    </variable>
    <variable require_translation="true">
      <title>Sexdecillion</title>
      <title xml:lang="nl">Octiljard</title>
      <title xml:lang="sv">Oktiljard</title>
      <names>-r:sexdecillion</names>
      <names xml:lang="nl">octiljard</names>
      <names xml:lang="sv">oktiljard,p:oktiljarder</names>
      <value>1E51</value>
    </variable>
    <variable require_translation="true">
      <title>Quindecillion</title>
      <title xml:lang="nl">Octiljoen</title>
      <title xml:lang="sv">Oktiljon</title>
      <names>-r:quindecillion</names>
      <names xml:lang="nl">octiljoen</names>
      <names xml:lang="sv">oktiljon,p:oktiljoner</names>
      <value>1E48</value>
    </variable>
    <variable require_translation="true">
      <title>Quattuordecillion</title>
      <title xml:lang="nl">Septiljard</title>
      <title xml:lang="sv">Septiljard</title>
      <names>-r:quattuordecillion</names>
      <names xml:lang="nl">septiljard</names>
      <names xml:lang="sv">septiljard,p:septiljarder</names>
      <value>1E45</value>
    </variable>
    <variable require_translation="true">
      <title>Tredecillion</title>
      <title xml:lang="nl">Septiljoen</title>
      <title xml:lang="sv">Septiljon</title>
      <names>-r:tredecillion</names>
      <names xml:lang="nl">septiljoen</names>
      <names xml:lang="sv">septiljon,p:septiljoner</names>
      <value>1E42</value>
    </variable>
    <variable require_translation="true">
      <title>Duodecillion</title>
      <title xml:lang="nl">Sextiljard</title>
      <title xml:lang="sv">Sextiljard</title>
      <names>-r:duodecillion</names>
      <names xml:lang="nl">sextiljard</names>
      <names xml:lang="sv">sextiljard,p:sextiljarder</names>
      <value>1E39</value>
    </variable>
    <variable require_translation="true">
      <title>Undecillion</title>
      <title xml:lang="nl">Sextiljoen</title>
      <title xml:lang="sv">Sextiljon</title>
      <names>-r:undecillion</names>
      <names xml:lang="nl">sextiljoen</names>
      <names xml:lang="sv">sextiljon,p:sextiljoner</names>
      <value>1E36</value>
    </variable>
    <variable require_translation="true">
      <title>Decillion</title>
      <title xml:lang="nl">Quintiljard</title>
      <title xml:lang="sv">Kvintiljard</title>
      <names>-r:decillion</names>
      <names xml:lang="nl">quintiljard</names>
      <names xml:lang="sv">kvintiljard,p:kvintiljarder</names>
      <value>1E33</value>
    </variable>
    <variable require_translation="true">
      <title>Nonillion</title>
      <title xml:lang="nl">Quintiljoen</title>
      <title xml:lang="sv">Kvintiljon</title>
      <names>-r:nonillion</names>
      <names xml:lang="nl">quintiljoen</names>
      <names xml:lang="sv">kvintiljon,p:kvintiljoner</names>
      <value>1E30</value>
    </variable>
    <variable require_translation="true">
      <title>Octillion</title>
      <title xml:lang="nl">Quadriljard</title>
      <title xml:lang="sv">Kvadriljard</title>
      <names>-r:octillion</names>
      <names xml:lang="nl">quadriljard</names>
      <names xml:lang="sv">kvadriljard,p:kvadriljarder</names>
      <value>1E27</value>
    </variable>
    <variable require_translation="true">
      <title>Septillion</title>
      <title xml:lang="nl">Quadriljoen</title>
      <title xml:lang="sv">Kvadriljon</title>
      <names>-r:septillion</names>
      <names xml:lang="nl">quadriljoen</names>
      <names xml:lang="sv">kvadriljon,p:kvadriljoner</names>
      <value>1E24</value>
    </variable>
    <variable require_translation="true">
      <title>Sextillion</title>
      <title xml:lang="nl">Triljard</title>
      <title xml:lang="sv">Triljard</title>
      <names>-r:sextillion</names>
      <names xml:lang="nl">triljard</names>
      <names xml:lang="sv">triljard,p:triljarder</names>
      <value>1E21</value>
    </variable>
    <variable require_translation="true">
      <title>Quintillion</title>
      <title xml:lang="nl">Triljoen</title>
      <title xml:lang="sv">Triljon</title>
      <names>-r:quintillion</names>
      <names xml:lang="nl">triljoen</names>
      <names xml:lang="sv">triljon,p:triljoner</names>
      <value>1E18</value>
    </variable>
    <variable require_translation="true">
      <title>Quadrillion</title>
      <title xml:lang="nl">Biljard</title>
      <title xml:lang="sv">Biljard</title>
      <names>-r:quadrillion</names>
      <names xml:lang="nl">biljard</names>
      <names xml:lang="sv">biljard,p:biljarder</names>
      <value>1E15</value>
    </variable>
    <variable require_translation="true">
      <title>Trillion</title>
      <title xml:lang="nl">Biljoen</title>
      <title xml:lang="sv">Biljon</title>
      <title xml:lang="zh_CN">兆</title>
      <names>-r:trillion</names>
      <names xml:lang="nl">biljoen</names>
      <names xml:lang="sv">biljon,p:biljoner</names>
      <value>1E12</value>
    </variable>
    <variable require_translation="true">
      <title>Billion</title>
      <title xml:lang="fr">Milliard</title>
      <title xml:lang="nl">Miljard</title>
      <title xml:lang="sv">Miljard</title>
      <title xml:lang="zh_CN">十亿</title>
      <names>-r:billion</names>
      <names xml:lang="nl">miljard</names>
      <names xml:lang="sv">miljard,p:miljarder</names>
      <value>1E9</value>
    </variable>
    <variable require_translation="true">
      <title>Million</title>
      <title xml:lang="fr">Million</title>
      <title xml:lang="nl">Miljoen</title>
      <title xml:lang="sv">Miljon</title>
      <title xml:lang="zh_CN">百万</title>
      <names>-r:million</names>
      <names xml:lang="nl">miljoen</names>
      <names xml:lang="sv">miljon,p:miljoner</names>
      <value>1E6</value>
    </variable>
    <variable require_translation="true">
      <title>Thousand</title>
      <title xml:lang="nl">Duizend</title>
      <title xml:lang="sv">Tusen</title>
      <title xml:lang="zh_CN">千</title>
      <names>-r:thousand</names>
      <names xml:lang="nl">duizend</names>
      <names xml:lang="sv">tusen</names>
      <value>1E3</value>
    </variable>
    <variable require_translation="true">
      <title>Hundred</title>
      <title xml:lang="nl">Honderd</title>
      <title xml:lang="sv">Hundra</title>
      <title xml:lang="zh_CN">百</title>
      <names>-r:hundred</names>
      <names xml:lang="nl">honderd</names>
      <names xml:lang="sv">hundra</names>
      <value>1E2</value>
    </variable>
  </category>
  <category>
    <title>Physical Constants</title>
    <title xml:lang="fr">Constantes Physiques</title>
    <title xml:lang="nl">Natuurkundige constanten</title>
    <title xml:lang="sv">Fysikaliska konstanter</title>
    <title xml:lang="zh_CN">物理常数</title>
    <category>
      <title>Universal Constants</title>
      <title xml:lang="fr">Constantes Universelles</title>
      <title xml:lang="nl">Universele constanten</title>
      <title xml:lang="sv">Universala konstanter</title>
      <title xml:lang="zh_CN">普适常数</title>
      <variable>
        <title>Speed of Light in Vacuum</title>
        <title xml:lang="fr">Vitesse de la Lumière dans le Vide</title>
        <title xml:lang="nl">Lichtsnelheid in vacuüm</title>
        <title xml:lang="sv">Ljusets hastighet i vakuum</title>
        <title xml:lang="zh_CN">真空中光速</title>
        <names>ar:c,speed_of_light</names>
        <names xml:lang="fr">a:c,vitesse_de_la_lumière</names>
        <names xml:lang="nl">a:c,licht_snelheid</names>
        <names xml:lang="sv">a:c,ljusets_hastighet</names>
        <value unit="m*s^(-1)">299792458</value>
      </variable>
      <variable>
        <title>Planck Time</title>
        <title xml:lang="fr">Temps de Planck</title>
        <title xml:lang="nl">Plancktijd</title>
        <title xml:lang="sv">Planck-tid</title>
        <title xml:lang="zh_CN">普朗克时间</title>
        <names>r:planck_time,ais:t_P</names>
        <names xml:lang="nl">planck_tijd,ais:t_P</names>
        <value unit="s" uncertainty="1.3E-48">5.39116E-44</value>
      </variable>
      <variable>
        <title>Planck Temperature</title>
        <title xml:lang="fr">Température de Planck</title>
        <title xml:lang="nl">Plancktemperatuur</title>
        <title xml:lang="sv">Planck-temperatur</title>
        <title xml:lang="zh_CN">普朗克温度</title>
        <names>r:planck_temperature,ais:T_P</names>
        <names xml:lang="fr">température_de_planck,ais:T_P</names>
        <names xml:lang="nl">planck_temperatuur,ais:T_P</names>
        <value unit="K" uncertainty="3.3E27">1.416808E32</value>
      </variable>
      <variable>
        <title>Planck Mass</title>
        <title xml:lang="fr">Masse de Planck</title>
        <title xml:lang="nl">Planckmassa</title>
        <title xml:lang="sv">Planck-massa</title>
        <title xml:lang="zh_CN">普朗克质量</title>
        <names>r:planck_mass,ais:m_P</names>
        <names xml:lang="fr">masse_de_planck,ais:m_P</names>
        <names xml:lang="nl">planck_massa,ais:m_P</names>
        <value unit="g" uncertainty="5.1E-10">2.176470E-5</value>
      </variable>
      <variable>
        <title>Planck Length</title>
        <title xml:lang="fr">Longueur de Planck</title>
        <title xml:lang="nl">Plancklengte</title>
        <title xml:lang="sv">Planck-längd</title>
        <title xml:lang="zh_CN">普朗克长度</title>
        <names>r:planck_length,ais:l_P</names>
        <names xml:lang="fr">longueur_de_planck,ais:l_P</names>
        <names xml:lang="nl">planck_lengte,ais:l_P</names>
        <value unit="m" uncertainty="3.8E-40">1.616229E-35</value>
      </variable>
      <variable>
        <title>Planck Constant</title>
        <title xml:lang="fr">Constantes de Planck</title>
        <title xml:lang="nl">Planck constante</title>
        <title xml:lang="sv">Plancks konstant</title>
        <title xml:lang="zh_CN">普朗克常数</title>
        <names>r:planck,au:&#x210e;</names>
        <value unit="J*s" uncertainty="8.1E-42">6.626070040E-34</value>
      </variable>
      <variable>
        <title>Planck Constant over 2 pi</title>
        <title xml:lang="fr">Constante de Planck sur 2 pi</title>
        <title xml:lang="nl">Planck constante gedeeld door 2 pi</title>
        <title xml:lang="sv">Plancks konstant över 2 pi</title>
        <title xml:lang="zh_CN">普朗克常数每2&#x3C0;</title>
        <names>r:planck2pi,au:&#x210f;</names>
        <value>planck/(2*pi)</value>
      </variable>
      <variable>
        <title>Newtonian Constant of Gravitation</title>
        <title xml:lang="fr">Constante de la Gravitation de Newton</title>
        <title xml:lang="nl">Newtons zwaartekrachtconstante</title>
        <title xml:lang="sv">Newtonska gravitationskonstanten</title>
        <title xml:lang="zh_CN">牛顿引力常数</title>
        <names>r:newtonian_constant,a:G</names>
        <names xml:lang="fr">constante_de_newton,a:G</names>
        <names xml:lang="nl">newton_constante,a:G</names>
        <value unit="m^3*kg^(-1)*s^(-2)" uncertainty="3.1E-15">6.67408E-11</value>
      </variable>
      <variable>
        <title>Electric Constant (Permittivity of Free Space)</title>
        <title xml:lang="fr">Constante Électrique (Permittivité du Vide)</title>
        <title xml:lang="nl">Elektrische constante (permittiviteit vrije ruimte)</title>
        <title xml:lang="sv">Elektriska konstanten</title>
        <title xml:lang="zh_CN">介电常数(自由空间介电常数)</title>
        <names>r:electric_constant,asu:&#x3B5;_0,vacuum_permittivity,aos:epsilon_0</names>
        <value unit="F*m^(-1)">1/(4E-7*pi*299792458^2)</value>
      </variable>
      <variable>
        <title>Magnetic Constant (Permeability of Free Space)</title>
        <title xml:lang="fr">Constante Magnétique (Perméabilité du Vide)</title>
        <title xml:lang="nl">Magnetische constante (permeabiliteit vrije ruimte)</title>
        <title xml:lang="sv">Magnetiska konstanten</title>
        <title xml:lang="zh_CN">磁常数(自由空间磁导率）</title>
        <names>r:magnetic_constant,asu:&#x3BC;_0,vacuum_permeability,aos:mu_0</names>
        <value unit="N*A^(-2)">4E-7*pi</value>
      </variable>
      <variable>
        <title>Characteristic Impedance of Vacuum</title>
        <title xml:lang="nl">Karakteristieke impedantie vacuüm</title>
        <title xml:lang="sv">Karaktäristisk impedans för vakuum</title>
        <title xml:lang="zh_CN">真空特性阻抗</title>
        <names>r:characteristic_impedance,ais:Z_0</names>
        <names xml:lang="fr">impédance_caractéristique,ais:Z_0</names>
        <names xml:lang="nl">karakteristieke_impedantie,ais:Z_0</names>
        <value unit="ohm">4E-7*pi*299792458</value>
      </variable>
    </category>
    <category>
      <title>Electromagnetic Constants</title>
      <title xml:lang="fr">Constantes Électromagnétiques</title>
      <title xml:lang="nl">Elektromagnetische constanten</title>
      <title xml:lang="sv">Elektromagnetiska konstanter</title>
      <title xml:lang="zh_CN">电磁常数</title>
      <variable>
        <title>Bohr Magneton</title>
        <title xml:lang="sv">Bohrs magneton</title>
        <title xml:lang="zh_CN">玻尔磁子</title>
        <names>r:bohr_magneton,asu:&#x3BC;_B,aos:mu_B</names>
        <value unit="J*T^(-1)" uncertainty="5.7E-32">927.4009994E-26</value>
      </variable>
      <variable>
        <title>Conductance Quantum</title>
        <title xml:lang="nl">Geleidingsvermogen kwantum</title>
        <title xml:lang="sv">Konduktanskvantum</title>
        <title xml:lang="zh_CN">量子电导</title>
        <names>r:conductance_quantum,ais:G_0</names>
        <names xml:lang="nl">geleidings_kwantum,ais:G_0</names>
        <value unit="S" uncertainty="1.8E-14">7.7480917310E-5</value>
      </variable>
      <variable>
        <title>Elementary Charge</title>
        <title xml:lang="fr">Charge Élémentaire</title>
        <title xml:lang="nl">Elementaire lading</title>
        <title xml:lang="sv">Elementarladdning</title>
        <title xml:lang="zh_CN">基本电荷</title>
        <names>r:elementary_charge,ais:e_charge</names>
        <names xml:lang="fr">charge_élémentaire,ais:e_charge</names>
        <names xml:lang="nl">elementaire_lading,ais:e_lading</names>
        <value unit="C" uncertainty="9.8E-28">1.6021766208E-19</value>
      </variable>
      <variable>
        <title>Josephson Constant</title>
        <title xml:lang="nl">Josephson constante</title>
        <title xml:lang="sv">Josephsons konstant</title>
        <title xml:lang="zh_CN">约瑟夫森常数</title>
        <names>r:josephson,ais:K_J</names>
        <value unit="Hz*V^(-1)" uncertainty="3.0E6">483597.8525E9</value>
      </variable>
      <variable>
        <title>Magnetic Flux Quantum</title>
        <title xml:lang="nl">Magnetische flux kwantum</title>
        <title xml:lang="sv">Magnetflödeskonstanten</title>
        <title xml:lang="zh_CN">磁通量量子</title>
        <names>r:magnetic_flux_quantum,asu:&#x3A6;_0,aos:phi_0</names>
        <value unit="Wb" uncertainty="1.3E-23">2.067833831E-15</value>
      </variable>
      <variable>
        <title>Nuclear Magneton</title>
        <title xml:lang="nl">Nucleaire magneton</title>
        <title xml:lang="sv">Kärnmagneton</title>
        <title xml:lang="zh_CN">核磁子</title>
        <names>r:nuclear_magneton,asu:&#x3BC;_N,aos:mu_N</names>
        <value unit="J*T^(-1)" uncertainty="3.1E-35">5.050783699E-27</value>
      </variable>
      <variable>
        <title>von Klitzing Constant</title>
        <title xml:lang="fr">Constante de von Klitzing</title>
        <title xml:lang="nl">von Klitzing constante</title>
        <title xml:lang="sv">von Klitzing-konstanten</title>
        <title xml:lang="zh_CN">冯·克里青常数</title>
        <names>r:klitzing,ais:R_K</names>
        <value unit="ohm" uncertainty="0.0000059">25812.8074555</value>
      </variable>
    </category>
    <category>
      <title>Atomic and Nuclear Constants</title>
      <title xml:lang="fr">Constantes Atomiques et Nucléaires</title>
      <title xml:lang="nl">Atomaire- en nucleaire constanten</title>
      <title xml:lang="sv">Atomära och nukleära konstanter</title>
      <title xml:lang="zh_CN">原子与核物理常数</title>
      <variable>
        <title>Alpha Particle Mass</title>
        <title xml:lang="nl">Massa alfadeeltje</title>
        <title xml:lang="sv">Alfapartikelmassa</title>
        <title xml:lang="zh_CN">&#x3B1;粒子质量</title>
        <names>r:alpha_particle_mass,aisu:m_&#x3B1;</names>
        <names xml:lang="fr">masse_de_particule_alpha,aisu:m_&#x3B1;</names>
        <names xml:lang="nl">alfa_deeltje_massa,aisu:m_&#x3B1;</names>
        <value unit="g" uncertainty="8.2E-32">6.644657230E-24</value>
      </variable>
      <variable>
        <title>Bohr Radius</title>
        <title xml:lang="fr">Rayon de Bohr</title>
        <title xml:lang="nl">Bohr-straal</title>
        <title xml:lang="sv">Bohr-radie</title>
        <title xml:lang="zh_CN">玻尔半径</title>
        <names>r:bohr_radius,ais:a_0</names>
        <value unit="m" uncertainty="1.2E-20">0.52917721067E-10</value>
      </variable>
      <variable>
        <title>Classical Electron Radius</title>
        <title xml:lang="nl">Klassieke straal elektron</title>
        <title xml:lang="sv">Klassisk elektron-radie</title>
        <title xml:lang="zh_CN">经典电子半径</title>
        <names>r:classical_electron_radius,ais:r_e</names>
        <names xml:lang="nl">klassieke_electron_radius,ais:r_e</names>
        <value unit="m" uncertainty="1.9E-24">2.8179403227E-15</value>
      </variable>
      <variable>
        <title>Compton Wavelength</title>
        <title xml:lang="nl">Compton golflengte</title>
        <title xml:lang="sv">Compton-våglängd</title>
        <title xml:lang="zh_CN">康普顿波长</title>
        <names>r:compton_wavelength,asu:&#x3BB;_C,aos:lambda_C</names>
        <value unit="m" uncertainty="1.1E-21">2.4263102367E-12</value>
      </variable>
      <variable>
        <title>Electron Mass</title>
        <title xml:lang="fr">Masse de l'Électron</title>
        <title xml:lang="nl">Elektronmassa</title>
        <title xml:lang="sv">Elektronmassa</title>
        <title xml:lang="zh_CN">电子质量</title>
        <names>r:electron_mass,ais:m_e</names>
        <names xml:lang="fr">masse_de_l'électron,ais:m_e</names>
        <names xml:lang="nl">elektron_massa,ais:m_e</names>
        <value unit="g" uncertainty="1.1E-35">9.10938356E-28</value>
      </variable>
      <variable>
        <title>Helion Mass</title>
        <title xml:lang="nl">Helionmassa</title>
        <title xml:lang="sv">Helion-massa</title>
        <title xml:lang="zh_CN">Helion质量</title>
        <names>r:helion_mass,ais:m_h</names>
        <names xml:lang="nl">helion_massa,ais:m_h</names>
        <value unit="g" uncertainty="6.2E-32">5.006412700E-24</value>
      </variable>
      <variable>
        <title>Neutron Mass</title>
        <title xml:lang="fr">Masse du Neutron</title>
        <title xml:lang="nl">Neutronmassa</title>
        <title xml:lang="sv">Neutronmassa</title>
        <title xml:lang="zh_CN">中子质量</title>
        <names>r:neutron_mass,ais:m_n</names>
        <names xml:lang="fr">masse_du_neutron,ais:m_n</names>
        <names xml:lang="nl">neutron_massa,ais:m_n</names>
        <value unit="g" uncertainty="2.1E-32">1.674927471E-24</value>
      </variable>
      <variable>
        <title>Proton Mass</title>
        <title xml:lang="fr">Masse du Proton</title>
        <title xml:lang="nl">Protonmassa</title>
        <title xml:lang="sv">Protonmassa</title>
        <title xml:lang="zh_CN">质子质量</title>
        <names>r:proton_mass,ais:m_p</names>
        <names xml:lang="fr">masse_du_proton,ais:m_p</names>
        <names xml:lang="nl">proton_massa,ais:m_p</names>
        <value unit="g" uncertainty="2.1E-32">1.672621898E-24</value>
      </variable>
      <variable>
        <title>Rydberg Constant</title>
        <title xml:lang="nl">Rydberg constante</title>
        <title xml:lang="sv">Rydbergs konstant</title>
        <title xml:lang="zh_CN">里德伯常数</title>
        <names>r:rydberg,aisu:R_&#x221E;</names>
        <value unit="m^(-1)" uncertainty="0.000065">10973731.568508</value>
      </variable>
      <variable>
        <title>Tau Mass</title>
        <title xml:lang="nl">Tau massa</title>
        <title xml:lang="sv">Tau-massa</title>
        <title xml:lang="zh_CN">&#x3B3;质量</title>
        <names>r:tau_mass,aisu:m_&#x3C4;</names>
        <names xml:lang="nl">tau_massa,aisu:m_&#x3C4;</names>
        <value unit="g" uncertainty="2.9E-28">3.16747E-24</value>
      </variable>
    </category>
    <category>
      <title>Physico-Chemical Constants</title>
      <title xml:lang="fr">Constantes Physico-Chimiques</title>
      <title xml:lang="nl">Fysisch-chemische constanten</title>
      <title xml:lang="sv">Fysikalisk-kemiska konstanter</title>
      <title xml:lang="zh_CN">物理化学常数</title>
      <variable>
        <title>Atomic Mass Constant</title>
        <title xml:lang="fr">Constante de Masse Atomique</title>
        <title xml:lang="nl">Atomaire massaconstante</title>
        <title xml:lang="sv">Atommassenhet</title>
        <title xml:lang="zh_CN">原子质量常数</title>
        <names>r:atomic_mass,ais:m_u</names>
        <names xml:lang="fr">masse_atomique,ais:m_u</names>
        <names xml:lang="nl">atoommassa,ais:m_u</names>
        <names xml:lang="sv">atommassa,ais:m_u</names>
        <value unit="g" uncertainty="2.0E-32">1.660539040E-24</value>
      </variable>
      <variable>
        <title>Avogadro Constant</title>
        <title xml:lang="fr">Constante d'Avogadro</title>
        <title xml:lang="nl">Avogadro's constante</title>
        <title xml:lang="sv">Avogadros konstant</title>
        <title xml:lang="zh_CN">阿佛加德罗常数</title>
        <names>r:avogadro,ais:N_A</names>
        <value unit="mol^(-1)" uncertainty="7.4E25">6.022140857E23</value>
      </variable>
      <variable>
        <title>Boltzmann Constant</title>
        <title xml:lang="fr">Constante de Boltzmann</title>
        <title xml:lang="nl">Constante van Boltzmann</title>
        <title xml:lang="sv">Boltzmanns konstant</title>
        <title xml:lang="zh_CN">玻耳兹曼常数</title>
        <names>r:boltzmann,ais:k_B</names>
        <value unit="J*K^(-1)" uncertainty="7.9E-30">1.38064852E-23</value>
      </variable>
      <variable>
        <title>Faraday Constant</title>
        <title xml:lang="fr">Constante de Faraday</title>
        <title xml:lang="nl">Faraday constante</title>
        <title xml:lang="sv">Faradays konstant</title>
        <title xml:lang="zh_CN">法拉第常数</title>
        <names>r:faraday</names>
        <value unit="C*mol^(-1)" uncertainty="0.00059">96485.33289</value>
      </variable>
      <variable>
        <title>First Radiation Constant</title>
        <title xml:lang="nl">Eerste stralingsconstante</title>
        <title xml:lang="sv">Första strålningskonstanten</title>
        <title xml:lang="zh_CN">第一辐射常数</title>
        <names>r:first_radiation,ais:c_1</names>
        <names xml:lang="nl">eerste_straling,ais:c_1</names>
        <value unit="W*m^2" uncertainty="4.6E-24">3.741771790E-16</value>
      </variable>
      <variable>
        <title>Ideal Gas Constant</title>
        <title xml:lang="fr">Constante des Gaz Parfaits</title>
        <title xml:lang="nl">Ideale gasconstante</title>
        <title xml:lang="sv">Gaskonstant</title>
        <title xml:lang="zh_CN">理想气体常数</title>
        <names>r:ideal_gas</names>
        <names xml:lang="nl">ideale_gas</names>
        <value unit="J*K^(-1)*mol^(-1)" uncertainty="0.0000048">8.3144598</value>
      </variable>
      <variable>
        <title>Second Radiation Constant</title>
        <title xml:lang="nl">Tweede stralingsconstante</title>
        <title xml:lang="sv">Andra strålningskonstanten</title>
        <title xml:lang="zh_CN">第二辐射常数</title>
        <names>r:second_radiation,ais:c_2</names>
        <names xml:lang="nl">tweede_straling,aisc_2</names>
        <value unit="m*K" uncertainty="8.3E-9">1.43877736E-2</value>
      </variable>
    </category>
  </category>
  <category>
    <title>Basic Constants</title>
    <title xml:lang="fr">Constantes Basiques</title>
    <title xml:lang="nl">Basisconstanten</title>
    <title xml:lang="sv">Grundläggande konstanter</title>
    <title xml:lang="zh_CN">基本常数</title>
    <variable>
      <title>Golden Ratio</title>
      <title xml:lang="fr">Le Nombre d'Or</title>
      <title xml:lang="nl">Gulden snede</title>
      <title xml:lang="sv">Golden ratio</title>
      <title xml:lang="zh_CN">黄金比例</title>
      <names>r:golden,au:&#x3C6;</names>
      <names xml:lang="nl">gouden,&#x3C6;</names>
      <value>(1+sqrt(5))/2</value>
    </variable>
    <variable>
      <title>Omega Constant</title>
      <title xml:lang="nl">Omega constante</title>
      <title xml:lang="sv">Omegakonstanten</title>
      <title xml:lang="zh_CN">&#x3A9;常数</title>
      <names>r:omega</names>
      <value>lambertw(1)</value>
    </variable>
    <variable>
      <title>Pythagoras' Constant (sqrt 2)</title>
      <title xml:lang="fr">Constante de Pythagore (sqrt 2)</title>
      <title xml:lang="nl">Pythagoras constante (sqrt 2)</title>
      <title xml:lang="sv">Pythagoras konstant (sqrt 2)</title>
      <title xml:lang="zh_CN">毕达哥拉斯常数(根号2)</title>
      <names>r:pythagoras</names>
      <names xml:lang="fr">pythagore</names>
      <value>sqrt(2)</value>
    </variable>
    <variable>
      <title>Apery's Constant</title>
      <title xml:lang="nl">Apery's constante</title>
      <title xml:lang="sv">Aperys konstant</title>
      <title xml:lang="zh_CN">Apery常数</title>
      <names>r:apery</names>
      <value>zeta(3)</value>
    </variable>
    <builtin_variable name="e">
      <title>Base of Natural Logarithms (e)</title>
      <title xml:lang="fr">La Base des Logarithmes Naturels (e)</title>
      <title xml:lang="nl">Grondtal natuurlijke logaritmen (e)</title>
      <title xml:lang="sv">Basen för naturliga logaritmer (e)</title>
      <title xml:lang="zh_CN">自然对数的底e</title>
      <names>r:e</names>
    </builtin_variable>
    <builtin_variable name="pi">
      <title>Archimedes' Constant (pi)</title>
      <title xml:lang="nl">Archimede's constante (pi)</title>
      <title xml:lang="sv">Archimedes konstant (pi)</title>
      <title xml:lang="zh_CN">圆周率(&#x3C0;)</title>
      <names>au:&#x3C0;,r:pi</names>
    </builtin_variable>
    <builtin_variable name="euler">
      <title>Euler's Constant</title>
      <title xml:lang="fr">Constante d'Euler</title>
      <title xml:lang="nl">Euler's constante</title>
      <title xml:lang="sv">Eulers konstant</title>
      <title xml:lang="zh_CN">欧拉常数</title>
      <names>au:&#x3B3;,r:euler</names>
    </builtin_variable>
    <builtin_variable name="catalan">
      <title>Catalan's Constant</title>
      <title xml:lang="nl">Catalan's constante</title>
      <title xml:lang="sv">Catalans konstant</title>
      <title xml:lang="zh_CN">Catalan常数</title>
      <names>r:catalan</names>
    </builtin_variable>
  </category>
  <category>
    <title>Special Numbers</title>
    <title xml:lang="nl">Bijzondere getallen</title>
    <title xml:lang="sv">Speciella nummer</title>
    <title xml:lang="zh_CN">特殊数字</title>
    <builtin_variable name="i">
      <title>Imaginary i (sqrt -1)</title>
      <title xml:lang="fr">Nombre Imaginaire i (tel que i^2 = -1)</title>
      <title xml:lang="nl">Imaginaire i (sqrt -1)</title>
      <title xml:lang="sv">Imaginärt i (sqrt -1)</title>
      <title xml:lang="zh_CN">虚数i(sqrt -1)</title>
      <names>r:i</names>
      <names xml:lang="nl">.</names>
    </builtin_variable>
    <builtin_variable name="plus_infinity">
      <title>Positive Infinity</title>
      <title xml:lang="fr">Infini Positif</title>
      <title xml:lang="nl">Positief oneindig</title>
      <title xml:lang="sv">Positiv oändlighet</title>
      <title xml:lang="zh_CN">正无穷</title>
      <names>a:&#x221E;,r:plus_infinity,r:infinity</names>
      <names xml:lang="sv">a:&#x221E;,oändlighet</names>
    </builtin_variable>
    <builtin_variable name="minus_infinity">
      <title>Negative Infinity</title>
      <title xml:lang="fr">Infini Négatif</title>
      <title xml:lang="nl">Negatief oneindig</title>
      <title xml:lang="sv">Negativ oändlighet</title>
      <title xml:lang="zh_CN">负无穷</title>
      <names>r:minus_infinity</names>
      <names xml:lang="fr">infini_négatif</names>
      <names xml:lang="nl">min_oneindig</names>
      <names xml:lang="sv">minus_oändlighet</names>
    </builtin_variable>
    <builtin_variable name="undefined">
      <title>Undefined</title>
      <title xml:lang="fr">Indéfini</title>
      <title xml:lang="nl">Ongedefinieerd</title>
      <title xml:lang="sv">Odefinierad</title>
      <title xml:lang="zh_CN">未定义的</title>
      <names>r:undefined</names>
      <names xml:lang="fr">indéfini</names>
      <names xml:lang="nl">ongedefinieerd</names>
      <names xml:lang="sv">odefinierad</names>
    </builtin_variable>
    <builtin_variable name="precision">
      <hidden>true</hidden>
      <title>Precision</title>
      <title xml:lang="sv">Precision</title>
      <names>r:precision</names>
    </builtin_variable>
    <variable>
      <title>False</title>
      <title xml:lang="fr">Faux</title>
      <title xml:lang="nl">Onwaar</title>
      <title xml:lang="sv">Falskt</title>
      <title xml:lang="zh_CN">假</title>
      <names>r:false,r:no</names>
      <names xml:lang="fr">faux,non</names>
      <names xml:lang="nl">onwaar,nee</names>
      <names xml:lang="sv">falskt,nej</names>
      <value>0</value>
    </variable>
    <variable>
      <title>True</title>
      <title xml:lang="fr">Vrai</title>
      <title xml:lang="nl">Waar</title>
      <title xml:lang="sv">Sant</title>
      <title xml:lang="zh_CN">真</title>
      <names>r:true,r:yes</names>
      <names xml:lang="fr">vrai,oui</names>
      <names xml:lang="nl">waar,ja</names>
      <names xml:lang="sv">sant,ja</names>
      <value>1</value>
    </variable>
  </category>
  <category>
    <title>Unknowns</title>
    <title xml:lang="fr">Inconnues</title>
    <title xml:lang="nl">Onbekenden</title>
    <title xml:lang="sv">Okända</title>
    <title xml:lang="zh_CN">未知数</title>
    <unknown>
      <names>r:x</names>
    </unknown>
    <unknown>
      <names>r:y</names>
    </unknown>
    <unknown>
      <names>r:z</names>
    </unknown>
  </category>
  <category>
    <title>Date &amp; Time</title>
    <title xml:lang="fr">Date &amp; Heure</title>
    <title xml:lang="nl">Datum &amp; Tijd</title>
    <title xml:lang="sv">Datum &amp; Tid</title>
    <title xml:lang="zh_CN">日期与时间</title>
    <builtin_variable name="today">
      <title>Today</title>
      <title xml:lang="sv">Idag</title>
      <names>r:today</names>
      <names xml:lang="sv">idag</names>
    </builtin_variable>
    <builtin_variable name="tomorrow">
      <title>Tomorrow</title>
      <title xml:lang="sv">Imorgon</title>
      <names>r:tomorrow</names>
      <names xml:lang="sv">imorgon</names>
    </builtin_variable>
    <builtin_variable name="yesterday">
      <title>Yesterday</title>
      <title xml:lang="sv">Igår</title>
      <names>r:yesterday</names>
      <names xml:lang="sv">igår</names>
    </builtin_variable>
    <builtin_variable name="now">
      <title>Now (date and time)</title>
      <title xml:lang="sv">Nu (datum och tid)</title>
      <names>r:now</names>
    </builtin_variable>
  </category>
</QALCULATE>