Question

explain the term latent heat of fusion and latent heat of vaporisation.

Answer 1

$LATENT\:HEAT\:OF\:FUSION$

The heat supplied during melting of solid is called latent heat (of fusion). It is so called because it does not raise the temperature of solid, i.e., remains hidden from the thermometer.

Latent heat of fusion is the amount of heat energy required to change one unit mass of a solid into liquid at atmospheric pressure at its melting point.

The SI unit of latent heat of fusion is joules per kilogram, i.e., J/kg.

Ice held in our hand feels more cold because it absorbs heat for melting from our hand.

$LATENT\:HEAT\:OF\:VAPORISATION$

Like melting, the temperature does not change during boiling although the liquid is continuously heated, i.e., the temperature remains constant till the whole liquid is converted into gas. This is because, initially when the liquid is heated, the heat supplied increases the kinetic energy of the molecules but once liquid starts boiling, the heat supplied is used up to ovecome the intermolecular forces of attraction between the molecules of the liquid and the liquid changes into its gaseous state. But the average kinetic energy of the system remains constant and hence, temperature also remains constant. Thus, the energy (heat) absorbed in changing a liquid into gaseous state at its boiling point is called Latent Heat Of Vaporisation.

Latent heat of Vaporisation is the amount of heat required to convert one unit mass of a liquid substance into vapour at its boiling point without a change in temperature.

The SI unit of Latent heat of Vaporisation is joule per kilogram, i.e., J/kg

Answer 2

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Question:Explain the term latent heat of fusion.
Answer:A solid state has closely packed molecules than liquid state. In the process of the melting, heat is absorbed from the surrounding to increase the intermolecular distance between the molecules to change the distance of the molecules.

The amount of heat energy required in the process of melting for a unit mass of solid to be converted into liquid is called Latent heat of fusion.

Heat Energy  Q=mL

where m  is the mass of the substance and  L is the latent heat of Fusion

SI unit of Latent Heat of Fusion is J/kg.
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Question:Explain the term latent heat of vaporization.
Answer:Latent heat of vapourisation is a physical property of a substance. When a material in liquid state is given energy, it changes its phase from liquid to vapour without change in temperature, the energy absorbed in the process is called latent heat of vaporization. The latent heat of vaporization of water is about 2260kJ/Kg  which is equal to 40. 8kJ/mol.
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HOPE THIS HELPS YOU!!! ^_^
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