What is an extensive property? ( in regards to enthalpy )

The extensive properties come under physical property which depends on the size of the system. The enthalpy comes under extensive property which is a thermodynamic property where the internal energy; and the pressure and volume of the system is related.

The change in enthalpy is related to energy transfer at certain pressure which is related to the endothermic and exothermic reactions taking place on the system. Since, all these reactions and heat transfer from the system to the environment is based on the physical property, enthalpy is called as extensive property.