This is a branch of physical chemistry, which deals with heat changes between the system and surroundings.
Some Terms Used in Thermodynamics
System – It is the part of the universe, which is taking for thermodynamics studies. It can be open, closed or isolated.
Surroundings – It is all the factors, which are found outside the system.
Boundary – It is what separates the system from the surroundings.
Enthalpy – It is the heat content of a given system. It is represented by ΔH.
Free Energy– It is the energy available for useful work. It is represented by ΔG. ΔG = ΔH – TΔS.
Entropy– It is the degree of randomness or disorderliness of a system. It is represented by ΔS.