Class 11 Physics Kinetic Theory Specific Heat Capacity for polyatomic gases

Specific Heat Capacity for polyatomic gases

  • Polyatomic gases will have 3 translational degree of freedom, 3 rotational degrees of freedom and ‘f’ number of vibrational modes.
  • Total internal energy of 1 mole of gas =(3x(1/2)kBT + 3x(1/2)kBT+ fkBT)x NA

((3/2) + (3/2) +f)RT = (3+f) RT.

  • CV=dU/dT = (3+f)R
  • CP=CV+R=(4+f)R
  • γ= CP/CV = (4+f)/(3+f)

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