Question

Why latent heat of steam decreases with increase in pressure

Answer 1

This is because the specific enthalpyof evaporation decreases as the steam pressure increases. The specific volume also decreases with increasing pressure, the amount of heat energy transferred in the same volume actually increases with steam pressure.

Answer 2

Answer:

The latent heat of steam decreases with an increase in pressure. Here is the reason given:

Explanation:

The amount of heat necessary to break the intermolecular interactions and convert water to the gaseous phase is referred to as the latent heat of vaporization. As the pressure rises, more heat is required to overcome the pressure force at work. As a result, the latent heat is greater.

The latent heat of condensation is the amount of heat lost when water freezes. The higher pressure aids in the binding of the molecules. As a result, less heat needs to be evacuated.

As a result, as pressure rises, the latent heat of vapourization falls and the latent heat of condensation rises.

Therefore, this is why the latent heat of steam decreases with increased pressure.

• When pressure is reduced, temperature rises.
• The temperature drops as the pressure rises.

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