There are two laws of thermodynamics, which describe in general terms energy and heat transfer. They are:
The First Law of Thermodynamics
Where
is the work done on a system and
is the heat energy supplied to the system.
represents the gain in energy of all forms of the system.
The Second Law of Thermodynamics
The Flow of Heat and Energy are such that the tendency is for Entropy to increase ie
or in plain English, “Heat flows from hot to cold bodies”.