# What Is Latent Heat Of Vaporization And Fusion?

## 5 Answers

Anonymous answered
Latent heat of vaporization is the quantity of heat energy required to transform 1 kg of water at its boiling point 100 Celsius completely into gas is known as latent heat of vaporization. During boiling the temperature of water remains constant at 100 Celsius although heat is being constantly supplied to it. Thermometer therefore does not register any increase in temperature above 100 Celsius. All the additional heat energy supplied to the boiling water at 100 Celsius is utilized to transform the liquid state water into gaseous state.

The quantity of heat energy required to transform one kg of ice completely into water at 0 Celsius is known as latent heat of fusion. It is obvious that one kg of water at 0 Celsius is completely frozen into ice, same amount of heat will be given off from it. All solids require latent heat of fusion for melting. Latent heat of fusion can be easily understood from molecular theory of matter. When a solid is heated its molecules start vibrating more vigorously. As a result its temperature rises. If the solid continuous to absorbed heat, a point will be reached when the vibrations of molecules will reach to such an extent that they overcome the attraction which keeps the molecules bound together as a solid. At this point the solid starts melting.
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Anonymous commented
Thanks very much youre all the help i needed
Anonymous answered
How much heat must be removed from 15L of water in order to freeze it,if the initial temperature of water is 12C ?
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Anonymous answered
Heat capacity
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Anonymous answered
It is the heat required to change 1kg of solid or liquid to liquid or gas
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naren israney answered
When a solid  is heated, we expect the temperature to RISE. However, we would surprised to see that it remains CONSTANT. Where does the HEAT supplied GO.    It remains LATENT i.e. The temperature REMAINS constant(Fusion Temperature) and the heat supplied is used to bring about the change of the physical state of solid into liquid.This happens till all solid fuses into liquid. After that the temperature starts RISING.Thus, it is referred to as the LATENT HEAT of FUSION.    Similarly, if we are talking about giving heat to boiling water, then once again the temperature REMAINS constant(BOILING point). Here the heat is used to change water into steam. This is therefore referred to as the latent heat of evaporation OR vaporization.
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