Latent heat of vaporization :

 The latent heat of vaporization is the amount of energy needed to change a substance from a liquid to a gas state, or vice versa, without changing its temperature.

Key points:

The latent heat of vaporization is measured in joules per kilogram (J/kg).

Different substances have different latent heats of vaporization.

The latent heat of vaporization is also known as the enthalpy of vaporization.

The latent heat of vaporization is a measure of the strength of the bonds between the atoms or molecules in a substance.

Real-world examples:

The latent heat of vaporization of water is 2260 J/kg. This means that it takes 2260 joules of energy to vaporize 1 kilogram of water at 100 degrees Celsius.

The latent heat of vaporization of iron is 6086 J/kg. This means that it takes 6086 joules of energy to vaporize 1 kilogram of iron at its boiling point.

Remember: The latent heat of vaporization is an important concept in many areas of science and engineering, including materials science, thermodynamics, and meteorology.