Change of state |latent heat| physics XI important question |

Latent heat

Latent heat of a substance is the amount of heat required to change the state of unit mass of the substance from liquid or from liquid to vapour  without any change in temperature.

Latent heat of fusion

latent heat of fusion is defined as the amount of heat required to change unit mass of a substance from the solid state to liquid state at a constant temperature.


The phenomenon of melting of ice due due to compression and freezing after removal of applied pressure is called regelation.

Differentiate between evaporation and boiling

Evaporation is a slow process in which a liquid changes into the vapour that takes place at the surface of a liquid and at all temperatures where a the boiling is the rapid process that takes place at all points of the volume.

Why is latent heat of vaporization of a liquid greater than that of latent heat of fusion?


The volume of the substance increases as the liquid change from liquid state to vapour state as compared to the change from solid to liquid. Hence against the sourrounding pressure larger amount of work is to be done. Due to this reason the latent heat of vaporization is so much larger than the latent heat of fusion

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