Question

What is the specific latent heat of fusion of ice in the CGS system?

Answer 1

Hint: Specific latent heat is the heat required to change the state of unit mass of substance without changing its temperature.
The latent heat of fusion of ice is defined as the amount of heat required to change 1 g of ice from ${{0}^{\circ }}C$ to water at the same temperature.

Complete answer:
Latent heat is the heat required to transit the phase of unit mass of a substance at a constant temperature. During heating the substances, the heat has been used up in changing the state; temperature remains the same till the state of the entire substance has changed.
Specific latent heat of fusion is the quantity of heat required to transit the phase of 1 g of solid into liquid at constant temperature.

Unit of latent heat is J/kg in the SI system and cal/g in the CGS system.

Dimensions of latent heat are $\left[ {{M}^{0}}{{L}^{2}}{{T}^{-2}} \right]$

For ice its value is $3.36\times {{10}^{5}}J/kg$ in SI-Units or $80cal/gram$ in CGS units.

Note:
Latent heat is the heat required to transit the phase of unit mass of a substance at a constant temperature. When a liquid is heated, it starts boiling and is changed into the vapor state. During the process the temperature of liquid remains constant and the amount of energy required only for change its state only that is from a liquid state to vapor state is known as latent heat of vaporization.