Abstract
It will be useful to present calculation method of available energy by van der Waals equation. The model of van der Waals gas is important to bind ideal gas change and existence gas change.
On the other hand, a part of available energy of the system is transposed between available energy and unavailable energy by variation of outer-parameter of surroundings. It is a transposition of available energy by variation of surroundings.
This paper describes a calculation method of available energy and transposition of available energy in van der Waals gas.
