Difference between characteristic and universal gas constant

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Some important point on the difference between characteristics gas constant and universal gas constant are explained below. Let us check out one by one below. You can also check out characteristics equation of gas, and general gas equation to know more about it.

Difference between characteristics gas constant and universal gas constant:

  • Constant gas characteristics vary from gas to gas but the constant of universal gas is fixed.
  • If you working at human scales, then use universal gas constant, whereas if you want to gas constant that defined per unit mass of a specific gas, then use the specific gas constant. 
  • The characteristic gas constant in equation P = RT is the value of R for a given gas for use. It is equal to the constant of universal gas divided by the molar mass of the particular gas.
  • Characteristics gas Constant applicable for an ideal gas, whereas universal gas constant applicable for a real gas. 
  • Units: Characteristics gas constant - k J / kg K and Universal gas constant - k J / kg mol K

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