Astro-Constants
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<category>nuclear</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name>PLANCK</name>
<alternateName/>
<description>Planck constant</description>
<value>6.62607015e-34</value>
<uncertainty type="relative">0</uncertainty>
<dimensions mass="1" length="2" time="-1"/>
<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>H_BAR</name>
<alternateName>HBAR</alternateName>
<description>the reduced Planck constant, Planck's constant (exact) /2pi</description>
<value>1.0545718176763e-34</value>
<uncertainty type="relative">1.5e-9</uncertainty>
<dimensions mass="1" length="2" time="-1"/>
<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>CHARGE_ELEMENTARY</name>
<alternateName>ELECTRON_CHARGE</alternateName>
<description>electron charge (defined positive)</description>
<value>1.602176634e-19</value>
<uncertainty type="relative">0</uncertainty>
<dimensions current="1" time="1"/>
<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>STEFAN_BOLTZMANN</name>
<alternateName/>
<symbol>
<symbolRepresentation>
<latex>\sigma</latex>
<html>&sigma;</html>
<unicode>σ</unicode>
</symbolRepresentation>
</symbol>
<description>Stefan-Boltzmann constant</description>
<value>5.670374419e-8</value>
<uncertainty type="relative">1.7e-10</uncertainty>
<dimensions mass="1" time="-3" temperature="-4"/>
<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>DENSITY_RADIATION</name>
<alternateName>A_RAD</alternateName>
<symbol>a</symbol>
<description>radiation density constant, 4 * sigma / c</description>
<value>7.565723e-16</value>
<uncertainty type="relative">2.3e-6</uncertainty>
<dimensions mass="1" length="-1" time="-1" temperature="-4"/>
<maxValue/>
<minValue/>
<source url="https://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_constant"/>
<source url="http://scienceworld.wolfram.com/physics/RadiationConstant.html"/>
<categoryList>
<category>fundamental</category>
<category>cosmology</category>
<category>electromagnetic</category>
<category>nuclear</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name>WIEN</name>
<alternateName/>
<symbol>b</symbol>
<description>Wien wavelength displacement law constant</description>
<value>2.897771955e-3</value>
<uncertainty type="relative">1e-10</uncertainty>
<dimensions length="1" temperature="1"/>
<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>ALPHA</name>
<alternateName/>
<symbol>
<symbolRepresentation>
<latex>\alpha</latex>
</symbolRepresentation>
</symbol>
<description>fine structure constant</description>
<value>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>IMPEDANCE_VACUUM</name>
<alternateName>VACUUM_IMPEDANCE</alternateName>
<symbol>
<symbolRepresentation>
<latex>Z_{0}</latex>
<html>Z<sub>0</sub></html>
<unicode>Zâ‚€</unicode>
</symbolRepresentation>
</symbol>
<description>characteristic impedance of vacuum</description>
<value>376.730313461</value>
<uncertainty type="relative">1e-50</uncertainty>
<dimensions mass="1" lenghth="2" time="-3" current="-2"/>
<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>PERMITIV_FREE_SPACE</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>8.8541878128e-12</value>
<uncertainty type="relative">1.5e-10</uncertainty>
<dimensions time="4" current="2" length="-3" mass="-1"/>
<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>PERMEABL_FREE_SPACE</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>1.25663706212e-6</value>
<uncertainty type="relative">1.5e-10</uncertainty>
<dimensions mass="1" length="1" time="-2" current="-2"/>
<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>
<category>nuclear</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
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