Entropy and enthalpy are common terms in thermodynamics. Entropy refers to the measurement of the amount of energy in a physical system that cannot be used to do work. It measures the disorder or randomness in the system during the chemical process.

The formula for entropy is S = q/T entropy is denoted as (S). The SI unit for entropy is joule per kelvin (J/K) Enthalpy; on the other hand, refers to the measurement of the heat content of a chemical or physical system.

It simply refers to the measurement of total energy in the system. The formula for calculating enthalpy is H = U + PV enthalpy is denoted as (H). The SI unit for enthalpy is joule per kilogram (J/Kg).

Enthalpy is the heat relocation taking place in constant pressure, while entropy gives an idea of the randomness of a system. Enthalpy and entropy are two terms verifying the reactions taking place in a system. Enthalpy and entropy are thermodynamic state functions.

When a response takes place, it may absorb or evolve heat. Carrying out the reaction at continuous pressure is called enthalpy. Enthalpy is the heat transfer which takes place in a constant pressure. Enthalpy is the first law of thermodynamics; however, entropy is the second law of thermodynamics.

Enthalpy can be employed to measure the change in energy of the system after the reaction. We can use enthalpy to measure the degree of disorder of the system after the reaction.