Table of Contents
Table of Contents
- Latent Heat of Fusion
- Latent Heat of Vaporisation
- Types of Vaporisation
– Rate of Evaporation
- Summary
- What’s Next?
In the previous segment, we learnt about Melting point and Boiling point. In this segment, we will learn about Latent heat of fusion and Latent heat of Vaporisation.
What is Latent heat of fusion?
The amount of heat energy required to change 1 kilogram of solid to liquid at atmospheric pressure at its melting point is known as the Latent heat of fusion.
What is Latent heat of vaporisation?
The amount of heat energy required to change 1 kilogram of liquid to gas at atmospheric pressure at its boiling point is known as Latent heat of vaporisation.
Types of vaporisation
Depending at the temperature at which a liquid changes to its vapour state, there are two types of vaporisation:
- Boiling: Liquid changing to vapour state at its boiling point is known as Boiling.
- Evaporation: Liquid changing to vapour state at any temperature below its boiling point is known as Evaporation.
For example, the boiling point of water is \[ 100^{\circ} \] Celsius, but when wet clothes are put out to dry, the water is lost without it reaching its boiling point.
During evaporation, the particles of matter in the top layer possess more kinetic energy than the particles in the lower layer. Due to this, they are able to break away from the binding force faster. This results in quick evaporation of the topmost layers.
Evaporated particles are converted to the liquid state by cooling.
