Game design FAQ. If you actually want to know how to become a game designer, start with the IGDA Breaking In site and Damion Schubert's Breaking In page, and check this list of game design blogs.
The first law of thermodynamics states that if a system follows a thermodynamic cycle (that is, ultimately returns to its initial state), then the total amount of heat transferred to the system over the course of the cycle is equal to the work performed by the system.
That is, the specific constant pressure heat capacity of a system is a function only of its enthalpy and temperature. Now by definition. Now since for an ideal gas Joule showed that internal energy is a function of temperature only, it follows from the above equation that enthalpy is a function of temperature only.