## Fundamental Constants

`GSL_CONST_MKS_SPEED_OF_LIGHT`
  The speed of light in vacuum, c.
`GSL_CONST_MKS_VACUUM_PERMEABILITY`
  The permeability of free space, \mu_0
`GSL_CONST_MKS_VACUUM_PERMITTIVITY`
  The permittivity of free space, \epsilon_0.
`GSL_CONST_NUM_AVOGADRO`
  Avogadro's number, N_a.
`GSL_CONST_MKS_FARADAY`
  The molar charge of 1 Faraday.
`GSL_CONST_MKS_BOLTZMANN`
  The Boltzmann constant, k.
`GSL_CONST_MKS_MOLAR_GAS`
  The molar gas constant, R_0.
`GSL_CONST_MKS_STANDARD_GAS_VOLUME`
  The standard gas volume, V_0.
`GSL_CONST_MKS_GAUSS`
  The magnetic field of 1 Gauss.
`GSL_CONST_MKS_MICRON`
  The length of 1 micron.
`GSL_CONST_MKS_HECTARE`
  The area of 1 hectare.
`GSL_CONST_MKS_MILES_PER_HOUR`
  The speed of 1 mile per hour.
`GSL_CONST_MKS_KILOMETERS_PER_HOUR`
  The speed of 1 kilometer per hour.