Question

Question
What is meant by Latent heat?
Question
Explain the types of latent heat?
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Answer 1

Answer-:

Latent Heat- It is the required amount of heat to a substance in order to convert unit mass of a substance from one phase to other phase.

$\bold{L = \frac{Q}{m} }$

Unit- J/Kg or Cal/g

$\bold{Dimension} \: - [ {L}^{2} {T}^{ - 2} ]$

Answer-:

There are two types of latent heat

(i) Latent Heat of Fusion- It is the amount of heat required to change the phase of unit mass of solid into liquid.

$L_{f} = Solid = > Liquid \\ L_{f} = \frac{Q}{m} \\ (L_{f})_{ice} = 80 \: cal/gm$

(ii) Latent Heat of Vaporization- It is the amount of heat required to change the phase of unit mass of liquid into vapour.

$L_{v} = Liquid = > Vapour \\ L_{v} = \frac{Q}{m} \\ (L_{v})_{water} = 536 \: cal/gm$

Answer 2

${\mathcal{\red{ANSWER}}}$

${\sf{\green{\underline{Latent\;Heat:-}}}}$

Latent heat is a form of energy that is absorbed or given out when the substance changes its state of matter when the substance reaches a specific boiling or melting point.

When latent heat is added, no temperature change occurs.

${\sf{\green{\underline{Types\;Of\;Latent\;Heat:-}}}}$

1) Latent heat of vapourization: The latent heat of vapourization of a liquid is the quantity of heat in joules required to convert 1 kg of the liquid (at its boiling point) to vapour or gas without change in temperature.

The latent heat of vapourisation of water is $\tt{22.5 \times 10^{5}\;J/Kg.}$

2) Latent heat of fusion: The latent heat of fusion of a solid is the quantity of heat in joules required to convert 1 kg of the solid (at its melting point) to liquid without change in temp.

The latent heat of fusion of a ice is $\tt{3.34 \times 10^{5}\;J/Kg.}$