MECHANICAL ENGINEERING
OVERVIEW
In physics 
and chemistry , thermodynamics (from the Greek θέρμη therme, meaning heat [1a] and δύναμις , dynamis, meaning power ) is the study of energy conversion between heat and mechanical work, and subsequently the macroscopic variables such as temperature , volume and pressure . Its progenitor, based on statistical predictions of the collective motion of particles from their microscopic behavior, is the field of statistical thermodynamics (or statistical mechanics ), a branch of statistical physics .[1b][1c][1d] Historically, thermodynamics developed out of a need to increase the efficiency of early steam engines .[1e][1]
“Thermodynamics is mainly concerned with the transformations of heat into mechanical work and the opposite transformations of mechanical work into heat.” —Ernesto Fermi [2]
