Latent Heat Formula

Definition of Latent Heat

Latent heat is the amount of heat energy required to change the state of a substance without changing its temperature. This energy is absorbed or evolved in the phase changes like melting, freezing, boiling, or condensation.

Formula For Latent Heat

The latent heat formula is given as,

L = Q / M 

Where,

• Q = quantity of heat

• M = mass of the substance

Solved Examples

Problem 1 : Find the latent heat of 5 kg material when the amount of heat for a change of phase is 400 k.cal.

Solution:    

Given,

Q = 400 k.cal  M = 5 kg

The formula of latent heat is given by, 

 L = Q / M 

L = 400 / 5

L = 80 k.cal/kg

Problem 2: The heat required for a phase change of 2 kg substance is 300k. cal. Find its latent heat.

Solution:

Given,

Q = 300 k. cal

M = 2 kg

The formula for latent heat is given as,

L = Q / M

L = 300 / 2

L = 150 k.cal/kg

 

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