The latent heat of vaporisation of a substance is always

Vaporization is the process in which a liquid changes into a gas. It occurs when the liquid’s temperature increases, providing sufficient energy to overcome intermolecular forces. There are two types: evaporation (surface process) and boiling (occurs throughout the liquid). Vaporization requires energy, known as latent heat of vaporization.
Chapter 10 of Class 11 Physics deals with thermal properties of matter. It covers topics like temperature and heat specific heat capacity heat transfer conduction convection and radiation thermal expansion of solids liquids and gases and the laws of thermodynamics. The chapter also discusses the concept of latent heat and the calorimetry principle.