The entropy of a a non-compact ideal gas

The entropy of a non-compact ideal gas is studied. The entropy of a non-compact ideal gas is calculated in the case of a non-compact gas with two spatial directions and a non-compact external constant. The entropy of the non-compact gas is found to be proportional to the average of the entropy of the two spatial directions. The entropy of the non-compact ideal gas is calculated using the non-compact gas theorem.