# Formula Specific Gas Constant Isobaric specific heat capacity    Isochoric specific heat capacity

## Specific gas constant

Unit
The specific gas constant depends on the gas under consideration and, by definition, gives the ratio of the molar gas constant $$R$$ to the molar mass $$M_{\text n}$$ of a gas.

GasSpecific gas constant $$R_{\text s}$$
Helium (He)$$2077.1 \, \frac{\mathrm J}{ \mathrm{kg}\, \mathrm{K} }$$
Methane (CH4)$$518.4 \, \frac{\mathrm J}{ \mathrm{kg}\, \mathrm{K} }$$
Nitrogen (N2)$$296.8 \, \frac{\mathrm J}{ \mathrm{kg}\, \mathrm{K} }$$
Oxygen (O2)$$259.8 \, \frac{\mathrm J}{ \mathrm{kg}\, \mathrm{K} }$$
Carbon dioxide (CO2)$$188.9 \, \frac{\mathrm J}{ \mathrm{kg}\, \mathrm{K} }$$

## Isobaric specific heat capacity

Unit
Specific heat capacity at constant pressure $$\mathit{\Pi}$$ indicates how much energy must be added to a kilogram of substance to heat it up by 1 Kelvin.

## Isochoric specific heat capacity

Unit
Specific heat capacity at constant volume $$V$$.