Latent heat of fusion:             

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

Key points:

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

Different substances have different latent heats of fusion.

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

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

Real-world examples:

The latent heat of fusion of water is 334 J/kg. This means that it takes 334 joules of energy to melt 1 kilogram of ice at 0 degrees Celsius.

The latent heat of fusion of iron is 247,000 J/kg. This means that it takes 247,000 joules of energy to melt 1 kilogram of iron at its melting point.

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