The specific latent heat of vaporization of a substance is the quantity of heat needed to change unit mass from

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Q: 2 (NDA-I/2022)
The specific latent heat of vaporization of a substance is the quantity of heat needed to change unit mass from

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,113,68,48,113,12,8

keywords: 

{'specific latent heat': [0, 0, 0, 1], 'vaporization': [1, 0, 1, 6], 'vapour': [0, 0, 1, 4], 'heat': [10, 3, 13, 46], 'temperature': [0, 1, 1, 7], 'liquid': [0, 0, 0, 1], 'substance': [2, 1, 7, 7], 'unit mass': [0, 0, 1, 1], 'quantity': [0, 0, 0, 1]}

a liquid to a gas at constant temperature and pressure. The specific latent heat of vaporization is typically given in units of J/kg.

When a substance changes from a liquid to a gas, it undergoes a phase change that involves the absorption of heat without a corresponding increase in temperature. This heat is used to break the intermolecular forces holding the liquid together and to provide the necessary energy for the molecules to overcome the forces of attraction and escape into the gas phase.

The specific latent heat of vaporization is a measure of how much heat is required per unit mass to accomplish this phase change. It is defined as the amount of heat required to vaporize one kilogram of a substance at its boiling point while keeping its temperature constant.