The Ideal Gas with Radiation

  • Rudolf Kippenhahn
  • Alfred Weigert
Part of the Astronomy and Astrophysics Library book series (AAL)


For an ideal gas consisting of n particles per unit volume that all have molecular weight μ, the equation of state is
$$ P = nkT = \frac{\Re }{\mu }\rho T, $$
with ϱ = nμmn (k = 1.38 × 10-16 erg K-1 = Boltzmann constant; ℜ = k/m u = 8.31 × 107 erg K-1g-1 = universal gas constant; mu = 1 amu = 1.66053 × 10-24 g = the atomic mass unit). Note that we here use the gas constant with a dimension (energy per K and per unit mass) different from that in thermodynamic text books (energy per K and per mole). This has the consequence that here the molecular weight m is dimensionless (instead of having the dimension mass per mole); it is simply the particle mass divided by 1 amu.


Free Electron Radiation Pressure Dimension Mass Deep Interior Helium Nucleus 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • Rudolf Kippenhahn
    • 1
  • Alfred Weigert
  1. 1.GöttingenGermany

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