nstante de acoplamiento de Fermi</title>
        <title xml:lang="fr">Constante de Fermi</title>
        <title xml:lang="ru">Константа слабого взаимодействия (постоянная Ферми)</title>
        <title xml:lang="sv">Fermi Coupling-konstanten</title>
        <title xml:lang="zh_CN">费米耦合常数</title>
        <names>r:fermi_coupling</names>
        <value unit="GeV^(-2)" uncertainty="6E-12">1.1663787E-5</value>
      </variable>
      <variable>
        <title>Fine-Structure Constant</title>
        <title xml:lang="es">Constante de estructura fina</title>
        <title xml:lang="fr">Constante de structure fine</title>
        <title xml:lang="nl">Fijnstructuurconstante</title>
        <title xml:lang="ru">Постоянная тонкой структуры</title>
        <title xml:lang="sv">Finstrukturkonstanten</title>
        <title xml:lang="zh_CN">精细结构常数</title>
        <names>r:fine_structure,au:&#x03B1;,ao:alpha</names>
        <value uncertainty="1.1E-12">7.2973525693E-3</value>
      </variable>
      <variable>
        <title>Hartree Energy (constant)</title>
        <title xml:lang="es">Energía de Hartree (constante)</title>
        <title xml:lang="fr">Hartree (constante)</title>
        <title xml:lang="nl">Hartree-energie (constante)</title>
        <title xml:lang="ru">Энергия Хартри (константа)</title>
        <title xml:lang="sv">Hartreeenergi (konstant)</title>
        <title xml:lang="zh_CN">哈特里能量(常数)</title>
        <names>rs:hartree_constant,as:Ha_constant</names>
        <value>2*rydberg*planck*c</value>
      </variable>
      <variable>
        <title>Quantum of Circulation</title>
        <title xml:lang="es">Cuanto de circulación</title>
        <title xml:lang="ru">Квант циркуляции скорости (для электрона)</title>
        <title xml:lang="sv">Cirkulationskvantum</title>
        <title xml:lang="zh_CN">环量量子</title>
        <names>r:quantum_circulation</names>
        <value>planck/(2*electron_mass)</value>
      </variable>
      <variable>
        <title>Quantum of Circulation times 2</title>
        <title xml:lang="es">Cuanto de circulación por 2</title>
        <title xml:lang="ru">Удвоенный квант циркуляции скорости (для электрона)</title>
        <title xml:lang="sv">Cirkulationskvantum gånger 2</title>
        <title xml:lang="zh_CN">环量量子×2</title>
        <names>r:quantum_circulation_2</names>
        <value>quantum_circulation*2</value>
      </variable>
      <variable>
        <title>Rydberg Constant</title>
        <title xml:lang="es">Constante de Rydberg</title>
        <title xml:lang="fr">Constante de Rydberg</title>
        <title xml:lang="nl">Rydberg constante</title>
        <title xml:lang="ru">Постоянная Ридберга</title>
        <title xml:lang="sv">Rydbergs konstant</title>
        <title xml:lang="zh_CN">里德伯常数</title>
        <names>r:rydberg,asu:R_&#x221E;</names>
        <value unit="m^(-1)" uncertainty="0.000021">10973731.568160</value>
      </variable>
      <variable>
        <title>Thomson cross section</title>
        <title xml:lang="es">Sección eficaz de Thomson</title>
        <title xml:lang="ru">Томсоновское сечение рассеяния электрона</title>
        <title xml:lang="sv">Thomsons krossektion</title>
        <title xml:lang="zh_CN">汤姆逊散射截面</title>
        <names>r:thomson_cross_section,asu:&#x03C3;_t,aos:sigma_t</names>
        <value>(8*pi/3)*classical_electron_radius^2</value>
      </variable>
      <variable>
        <title>Weak Mixing Angle (Weinberg Angle)</title>
        <title xml:lang="es">Ángulo de mezcla débil (ángulo de Weinberg)</title>
        <title xml:lang="fr">Angle de Weinberg</title>
        <title xml:lang="ru">Угол смешивания слабого взаимодействия (угол Вайнберга)</title>
        <title xml:lang="sv">Svag blandningsvinken (Weinbergvinkeln)</title>
        <title xml:lang="zh_CN">溫伯格角</title>
        <names>r:weinberg,weak_mixing_angle,asu:&#x03B8;_W,aos:theta_W</names>
        <value uncertainty="0.00030">0.22290</value>
      </variable>
      <variable>
        <title>W to Z Mass Ratio</title>
        <title xml:lang="es">Relación de masa de W a Z</title>
        <title xml:lang="fr">Fraction massique</title>
        <title xml:lang="ru">Отношение масс W и Z бозонов</title>
        <title xml:lang="sv">W till Z massförhållande</title>
        <title xml:lang="zh_CN">W与Z玻色子质量比</title>
        <names>r:w_z_ratio</names>
        <value uncertainty="0.00017">0.88153</value>
      </variable>
    </category>
    <category>
      <title>Physico-Chemical Constants</title>
      <title xml:lang="es">Constantes físico-químicas</title>
      <title xml:lang="fr">Constantes physico-chimiques</title>
      <title xml:lang="nl">Fysisch-chemische constanten</title>
      <title xml:lang="ru">Физико-химические константы</title>
      <title xml:lang="sv">Fysikalisk-kemiska konstanter</title>
      <title xml:lang="zh_CN">物理化学常数</title>
      <variable>
        <title>Lattice Spacing of Ideal Silicon (220)</title>
        <title xml:lang="es">Espaciado de red de silicio ideal (220)</title>
        <title xml:lang="ru">Период кристаллической решётки идеального кремния (220)</title>
        <title xml:lang="sv">Gitteravstånd för idealt silikon (220)</title>
        <title xml:lang="zh_CN">理想硅的晶格间距(220)</title>
        <names>rs:lattice_spacing_Si220,as:d_220</names>
        <value>lattice_parameter_Si/sqrt(8)</value>
      </variable>
      <variable>
        <title>Atomic Mass Constant</title>
        <title xml:lang="es">Constante de masa atómica</title>
        <title xml:lang="fr">Constante de masse atomique</title>
        <title xml:lang="nl">Atomaire massaconstante</title>
        <title xml:lang="ru">Атомная единица массы (а. е. м.)</title>
        <title xml:lang="sv">Atommassakonstanten</title>
        <title xml:lang="zh_CN">原子质量常数</title>
        <names>r:atomic_mass_constant,as:m_u</names>
        <value units="auto">(2*rydberg*planck)/(c*fine_structure^2*nounit(electron_u))</value>
      </variable>
      <variable>
        <title>Avogadro Constant</title>
        <title xml:lang="es">Constante de Avogadro</title>
        <title xml:lang="fr">Constante d'Avogadro</title>
        <title xml:lang="nl">Constante van Avogadro</title>
        <title xml:lang="ru">Постоянная Авогадро</title>
        <title xml:lang="sv">Avogadros konstant</title>
        <title xml:lang="zh_CN">阿伏伽德罗常数</title>
        <names>r:avogadro,as:N_A</names>
        <value unit="mol^(-1)">6.02214076E23</value>
      </variable>
      <variable>
        <title>Boltzmann Constant</title>
        <title xml:lang="es">Constante de Boltzmann</title>
        <title xml:lang="fr">Constante de Boltzmann</title>
        <title xml:lang="nl">Boltzmannconstante</title>
        <title xml:lang="ru">Постоянная Больцмана</title>
        <title xml:lang="sv">Boltzmanns konstant</title>
        <title xml:lang="zh_CN">玻耳兹曼常数</title>
        <names>r:boltzmann,as:k_B</names>
        <value unit="J*K^(-1)">1.380649E-23</value>
      </variable>
      <variable>
        <title>Molar Mass Constant</title>
        <title xml:lang="es">Constante de masa molar</title>
        <title xml:lang="fr">Constante de masse molaire</title>
        <title xml:lang="ru">Молярная единица массы</title>
        <title xml:lang="sv">Molmassakonstant</title>
        <title xml:lang="zh_CN">摩尔质量常数</title>
        <names>r:molar_mass,as:M_u</names>
        <value>(2*planck*rydberg*avogadro)/(c*fine_structure^2*nounit(electron_u))</value>
      </variable>
      <variable>
        <title>Compton Wavelength</title>
        <title xml:lang="es">Longitud de onda de Compton</title>
        <title xml:lang="fr">Longueur d'onde de Compton</title>
        <title xml:lang="nl">Compton golflengte</title>
        <title xml:lang="ru">Комптоновская длина волны (для электрона)</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>planck/(electron_mass*c)</value>
      </variable>
      <variable>
        <title>Reduced Compton Wavelength</title>
        <title xml:lang="es">Longitud de onda de Compton reducida</title>
        <title xml:lang="fr">Longueur d'onde de Compton réduite</title>
        <title xml:lang="nl">Gereduceerde Compton golflengte</title>
        <title xml:lang="ru">Приведённая комптоновская длина волны (для электрона)</title>
        <title xml:lang="sv">Reducerad Compton-våglängd</title>
        <title xml:lang="zh_CN">约化康普顿波长</title>
        <names>r:compton_wavelength_2pi</names>
        <value>compton_wavelength/(2*pi)</value>
      </variable>
      <variable>
        <title>Electronvolt (constant)</title>
        <title xml:lang="es">Electronvoltio (constante)</title>
        <title xml:lang="fr">Électronvolt (constante)</title>
        <title xml:lang="nl">Elektronvolt (constante)</title>
        <title xml:lang="ru">Электронвольт (постоянная)</title>
        <title xml:lang="sv">Elektronvolt (konstant)</title>
        <title xml:lang="zh_CN">电子伏(常数)</title>
        <names>rs:electronvolt_constant,as:eV_constant</names>
        <value unit="auto">elementary_charge/C*J</value>
      </variable>
      <variable>
        <title>Faraday Constant</title>
        <title xml:lang="es">Constante de Faraday</title>
        <title xml:lang="fr">Constante de Faraday</title>
        <title xml:lang="nl">Faradayconstante</title>
        <title xml:lang="ru">Постоянная Фарадея</title>
        <title xml:lang="sv">Faradays konstant</title>
        <title xml:lang="zh_CN">法拉第常数</title>
        <names>r:faraday,au:&#x2131;</names>
        <value>avogadro*elementary_charge</value>
      </variable>
      <variable>
        <title>First Radiation Constant</title>
        <title xml:lang="es">Primera constante de radiación</title>
        <title xml:lang="nl">Eerste stralingsconstante</title>
        <title xml:lang="ru">Постоянная радиационная первая</title>
        <title xml:lang="sv">Första strålningskonstanten</title>
        <title xml:lang="zh_CN">第一辐射常数</title>
        <names>r:first_radiation,as:c_1</names>
        <value>2*pi*planck*c^2</value>
      </variable>
      <variable>
        <title>First Radiation Constant for Spectral Radiance</title>
        <title xml:lang="es">Primera constante de radiación para radiancia espectral</title>
        <title xml:lang="ru">Постоянная радиационная первая для спектральной яркости</title>
        <title xml:lang="sv">Första strålningskonstanten för spektralradians</title>
        <title xml:lang="zh_CN">光谱辐射的第一辐射常数</title>
        <names>rs:first_radiation_sr,as:c_1L</names>
        <value>first_radiation/pi</value>
      </variable>
      <variable>
        <title>Gas Constant</title>
        <title xml:lang="es">Constante de los gases ideales</title>
        <title xml:lang="fr">Constante universelle des gaz parfaits</title>
        <title xml:lang="nl">Gasconstante</title>
        <title xml:lang="ru">Газовая постоянная</title>
        <title xml:lang="sv">Gaskonstanten</title>
        <title xml:lang="zh_CN">气体常数</title>
        <names>r:gas_constant,ideal_gas</names>
        <value>boltzmann*avogadro</value>
      </variable>
      <variable>
        <title>Lattice Parameter of Silicon</title>
        <title xml:lang="es">Parámetro de red del silicio</title>
        <title xml:lang="ru">Постоянная решётки кремния</title>
        <title xml:lang="sv">Gitterparameter för silikon</title>
        <title xml:lang="zh_CN">硅晶格参数</title>
        <names>rs:lattice_parameter_Si</names>
        <value unit="m" uncertainty="8.9E-18">543.1020511E-12</value>
      </variable>
      <variable>
        <title>Loschmidt Constant (273.15 K, 100 kPa)</title>
        <title xml:lang="es">Constante de Loschmidt (273.15 K, 100 kPa)</title>
        <title xml:lang="fr">Constante de Loschmidt (273.15 K, 100 kPa)</title>
        <title xml:lang="ru">Постоянная Лошмидта (273,15 К, 100 кПа)</title>
        <title xml:lang="sv">Loschmidts konstant (273.15 K, 100 kPa)</title>
        <title xml:lang="zh_CN">洛施密特常数(273.15K,100kPa)</title>
        <names>loschmidt_100</names>
        <value unit="auto">(100000*Pa)/(boltzmann*273.15*K)</value>
      </variable>
      <variable>
        <title>Loschmidt Constant (273.15 K, 101.325 kPa)</title>
        <title xml:lang="es">Constante de Loschmidt (273.15 K, 101.325 kPa)</title>
        <title xml:lang="fr">Constante de Loschmidt (273.15 K, 101.325 kPa)</title>
        <title xml:lang="ru">Постоянная Лошмидта (273,15 К, 101,325 кПа)</title>
        <title xml:lang="sv">Loschmidts konstant (273.15 K, 101.325 kPa)</title>
        <title xml:lang="zh_CN">洛施密特常数(273.15K,101.325kPa)</title>
        <names>rs:loschmidt,as:n_0</names>
        <value unit="auto">(101325*Pa)/(boltzmann*273.15*K)</value>
      </variable>
       <variable>
        <title>Molar Planck Constant</title>
        <title xml:lang="es">Constante de Planck molar</title>
        <title xml:lang="fr">Constantes de Planck</title>
        <title xml:lang="ru">Молярная постоянная Планка</title>
        <title xml:lang="sv">Molplanckkonstant</title>
        <title xml:lang="zh_CN">摩尔普朗克常数</title>
        <names>r:molar_planck</names>
        <value>avogadro*planck</value>
      </variable>
      <variable>
        <title>Molar Volume of Ideal Gas (273.15 K, 100 kPa)</title>
        <title xml:lang="es">Volumen molar del gas ideal (273.15 K, 100 kPa)</title>
        <title xml:lang="fr">Volume molaire du gaz parfait (273.15 K, 100 kPa)</title>
        <title xml:lang="nl">Molaire volume van één mol ideaal gas (273.15 K, 100 kPa)</title>
        <title xml:lang="ru">Молярный объём идеального газа (273,15 К, 100 кПа)</title>
        <title xml:lang="sv">Molvolym för ideal gas (273.15 K, 100 kPa)</title>
        <title xml:lang="zh_CN">理想气体的摩尔体积(273.15K,100kPa)</title>
        <names>r:ideal_gas_molar,as:V_m</names>
        <value unit="auto">(gas_constant*273.15*K)/(100000*Pa)</value>
      </variable>
      <variable>
        <title>Molar Volume of Ideal Gas (273.15 K, 101.325 kPa)</title>
        <title xml:lang="es">Volumen molar del gas ideal (273.15 K, 101.325 kPa)</title>
        <title xml:lang="fr">Volume molaire du gaz parfait (273.15 K, 101.325 kPa)</title>
        <title xml:lang="nl">Molaire volume van één mol ideaal gas (273.15 K, 101.325 kPa)</title>
        <title xml:lang="ru">Молярный объём идеального газа (273,15 К, 101,325 кПа)</title>
        <title xml:lang="sv">Molvolym för ideal gas (273.15 K, 101.325 kPa)</title>
        <title xml:lang="zh_CN">理想气体的摩尔体积(273.15K,101.325kPa)</title>
        <names>rs:ideal_gas_molar_101,as:V_m101</names>
        <value unit="auto">(gas_constant*273.15*K)/(101325*Pa)</value>
      </variable>
      <variable>
        <title>Sackur-Tetrode constant (1 K, 100 kPa)</title>
        <title xml:lang="es">Constante de Sackur-Tetrode (1 K, 100 kPa)</title>
        <title xml:lang="fr">Constante de Sackur-Tetrode (1 K, 100 kPa)</title>
        <title xml:lang="ru">Постоянная Сакура–Тетроде (1 К, 100 кПа)</title>
        <title xml:lang="sv">Sackur-Tetrodes konstant (1 K, 100 kPa))</title>
        <title xml:lang="zh_CN">Sackur-Tetrode常数(1K,100kPa)</title>
        <names>r:sackur_tetrode</names>
        <value uncertainty="4.5E-10">-1.15170753706</value>
      </variable>
      <variable>
        <title>Sackur-Tetrode constant (1 K, 101.325 kPa)</title>
        <title xml:lang="es">Constante de Sackur-Tetrode (1 K, 101.325 kPa)</title>
        <title xml:lang="fr">Constante de Sackur-Tetrode (1 K, 101.325 kPa)</title>
        <title xml:lang="ru">Постоянная Сакура–Тетроде (1 К, 101,325 кПа)</title>
        <title xml:lang="sv">Sackur-Tetrodes konstant (1 K, 101.325 kPa)</title>
        <title xml:lang="zh_CN">Sackur-Tetrode常数(1K,101325 kPa)</title>
        <names>rs:sackur_tetrode_101</names>
        <value uncertainty="4.5E-10">-1.16487052358</value>
      </variable>
      <variable>
        <title>Second Radiation Constant</title>
        <title xml:lang="es">Segunda constante de radiación</title>
        <title xml:lang="nl">Tweede stralingsconstante</title>
        <title xml:lang="ru">Постоянная радиационная вторая</title>
        <title xml:lang="sv">Andra strålningskonstanten</title>
        <title xml:lang="zh_CN">第二辐射常数</title>
        <names>r:second_radiation,as:c_2</names>
        <value>planck*c/boltzmann</value>
      </variable>
      <variable>
        <title>Stefan-Boltzmann Constant</title>
        <title xml:lang="es">Co