Astro-Constants
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data/old_versions/constants_2020_v0.14.xml  view on Meta::CPAN 

      <description>Planck constant</description>
      <value system="MKS">6.62607015e-34</value>
      <value system="CGS">6.62607015e-27</value>
      <uncertainty type="relative">0</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?h" authority="2018 CODATA" year="2019"/>
      <categoryList>
        <category>fundamental</category>
        <category>cosmology</category>
        <category>electromagnetic</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">H_BAR</name>
      <name type="short">A_hbar</name>
      <alternateName>HBAR</alternateName>
      <description>the reduced Planck constant, Planck's constant (exact) /2pi</description>
      <value system="MKS">1.0545718176763e-34</value>
      <value system="CGS">1.054571817e-27</value>
      <uncertainty type="relative">1.5e-9</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?hbar" authority="2018 CODATA" year="2019"/>
      <categoryList>
        <category>fundamental</category>
        <category>cosmology</category>
        <category>electromagnetic</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">CHARGE_ELEMENTARY</name>
      <name type="short">A_e</name>
      <alternateName>ELECTRON_CHARGE</alternateName>
      <description>electron charge (defined positive)</description>
      <value system="MKS">1.602176634e-19</value>
      <value system="CGS">4.8032046729e-10</value>
      <uncertainty type="relative">0</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?e"/>
      <categoryList>
        <category>fundamental</category>
        <category>electromagnetic</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">STEFAN_BOLTZMANN</name>
      <name type="short">A_sigma</name>
      <alternateName/>
      <symbol>
	<symbolRepresentation>
	  <latex>\sigma</latex>
	  <html>&amp;sigma;</html>
	  <unicode>σ</unicode>
        </symbolRepresentation>
      </symbol>
      <description>Stefan-Boltzmann constant</description>
      <value system="MKS">5.670374419e-8</value>
      <value system="CGS">5.670367e-5</value>
      <uncertainty type="relative">1.7e-10</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?sigma" authority="2018 CODATA" year="2019" />
      <source url="https://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_constant"/>
      <categoryList>
        <category>fundamental</category>
        <category>cosmology</category>
        <category>electromagnetic</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">DENSITY_RADIATION</name>
      <name type="short">A_arad</name>
      <alternateName>A_RAD</alternateName>
      <description>radiation density constant, 4 * sigma / c</description>
      <value system="MKS">7.565723e-16</value>
      <value system="CGS">7.565723e-15</value>
      <uncertainty type="relative">2.3e-6</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="https://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_constant"/>
      <categoryList>
        <category>fundamental</category>
        <category>cosmology</category>
        <category>electromagnetic</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">WIEN</name>
      <name type="short">A_Wien</name>
      <alternateName/>
      <symbol>b</symbol>
      <description>Wien wavelength displacement law constant</description>
      <value system="MKS">2.897771955e-3</value>
      <value system="CGS">2.897771955e-1</value>
      <uncertainty type="relative">1e-10</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?bwien" authority="2018 CODATA" year="2019" />
      <categoryList>
        <category>fundamental</category>
        <category>electromagnetic</category>
        <category>cosmology</category>
        <category>planetary</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">ALPHA</name>
      <name type="short">A_alpha</name>
      <alternateName/>
      <symbol>
	<symbolRepresentation>
	  <latex>\alpha</latex>
        </symbolRepresentation>
      </symbol>
      <description>fine structure constant</description>
      <value system="MKS">7.2973525693e-3</value>
      <value system="CGS">7.2973525693e-3</value>
      <uncertainty type="relative">1.5e-10</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?alph" authority="2018 CODATA" year="2019" />
      <categoryList>
        <category>fundamental</category>
        <category>cosmology</category>
        <category>electromagnetic</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">IMPEDANCE_VACUUM</name>
      <name type="short">A_Z0</name>
      <alternateName>VACUUM_IMPEDANCE</alternateName>
      <symbol>
	<symbolRepresentation>
          <latex>Z_{0}</latex>
	  <html>Z&lt;sub&gt;0&lt;/sub&gt;</html>
	  <unicode>Zâ‚€</unicode>
        </symbolRepresentation>
      </symbol>
      <description>characteristic impedance of vacuum</description>
      <value>376.730313461</value>
      <uncertainty type="relative">1e-50</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?z0"/>
      <categoryList>
        <category>fundamental</category>
        <category>cosmology</category>
        <category>electromagnetic</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">PERMITIV_FREE_SPACE</name>
      <name type="short">A_eps0</name>
      <alternateName>PERMITIVITY_0</alternateName>
      <symbol>
	<symbolRepresentation>
	  <latex>\varepsilon_{0}</latex>
        </symbolRepresentation>
      </symbol>
      <description>permittivity of free space, epsilon_0, the electric constant</description>
      <value system="MKS">8.8541878128e-12</value>
      <value system="CGS">1</value>
      <uncertainty type="relative">1.5e-10</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?ep0" authority="2018 CODATA" year="2019" />
      <categoryList>
        <category>fundamental</category>
        <category>electromagnetic</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name type="long">PERMEABL_FREE_SPACE</name>
      <name type="short">A_mu0</name>
      <alternateName>PERMEABILITY_0</alternateName>
      <alternateName>CONSTANT_MAGNETIC</alternateName>
      <symbol>
	<symbolRepresentation>
	  <latex>\mu_{0}</latex>
        </symbolRepresentation>
      </symbol>
      <description>permeability of free space, mu_0, the magnetic constant</description>
      <value system="MKS">1.25663706212e-6</value>
      <value system="CGS">1</value>
      <uncertainty type="relative">1.5e-10</uncertainty>
      <dimensions/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?mu0" authority="2018 CODATA" year="2019"/>
      <categoryList>
        <category>fundamental</category>
        <category>electromagnetic</category>



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