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Heat is energy transferred between substances due to a temperature difference, heat travels from a hot body to a colder body. There are 3 methods of heat transfer Conduction, Convection and Radiation. Entropy is a measurement of how much disorder there can be in a physical system.

Laws of thermodynamics

Zeroth law: if two bodies have reached a thermal equilibrium then if a third bodies comes into contact with them the third body will reach a thermal equilibrium.


Law 1: the internal heat of an object is equal to the heat added.


Law 2: the entropy of a system almost never decreases.


Law 3: at -273.15 degrees Celsius, or 0 Kelvin, the entropy of a system is zero.