The theory of heat and temperature, encompassing both the macroscopic
behavior of bodies, and the statistical description of the
submicroscopic world of particle motions.
Laws of Thermodynamics:
- First Law: A statement of the conservation
of energy: The change of the energy of a system is equal to the heat
added plus the work done on the system.
- Second Law: The Entropy
of an isolated system can only increase with time. Also can be
stated: heat never flows spontaneously from a cooler to a hotter
body. (Perpetual motion is impossible.) See Also: Arrow of Time.
- Third Law: Absolute
Zero can never be attained, only approached arbitrarily closely.