Latent heat corresponds to the change in heat at constant

by

Latent heat corresponds to the change in heat at constant

temperature only
volume only
pressure only
temperature, volume and pressure
This question was previously asked in
UPSC CAPF – 2020
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Latent heat corresponds to the change in heat required for a substance to undergo a phase transition (like melting, boiling, or condensation) at a constant temperature.
During a phase change at constant pressure, the temperature remains constant while heat energy is absorbed (for melting/boiling/sublimation) or released (for freezing/condensation/deposition). This energy is used to change the state (break or form intermolecular bonds) rather than increase the kinetic energy of the molecules, which would result in a temperature change.
For typical phase transitions under standard conditions, pressure is also constant. However, the defining characteristic of latent heat is that it is the energy involved in a phase change *without* a change in temperature. Volume typically changes during a phase transition.

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