什么是热力学？（宏观角度）

The transfer of kinetic energy in the molecular form that is essential to most of the processes in our world. It is in essence the relationships between heat and other types of energy.

Macroscopic thermodynamics concerns itself with the macroscopic properties of a system. Such properties include energy, volume, temperature and pressure among many others. These are properties that be measures as a whole (sort of) as compared to things like the motion of individual atoms or molecules.