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Asked by Pratheema Last Modified
Answer 
When the state of matter (solid -> liquid, liquid-> vapour, vapour -> liquid, liquid -> solid) does not change all of a sudden as the soon its transition temperature is reached. So what happens to a block of ice kept at room temperature (say at 27-degree Celsius ). The molecules in the liquid state of matter will have a higher internal energy as compared when the matter is in the solid state. The melting point is the temperature at which the solid transitioned into liquid. The heat supplied is fully utilised to convert the solid into the liquid state at the melting point of the solid. Thus its temperature does not rise.
It is because of latent heat of fusion. The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure. When any solid is heated it starts melting, then the heat energy that we are applying is used to loosen the intermolecular force of particles. So, when a solid melts, the temperature of the system does not change after the melting point is reached even when we continue to supply heat.
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When the state of matter (solid -> liquid, liquid-> vapour, vapour -> liquid, liquid -> solid) does not change all of a sudden as the soon its transition temperature is reached. So what happens to a block of ice kept at room temperature (say at 27-degree Celsius ). The molecules in the liquid state of matter will have a higher internal energy as compared when the matter is in the solid state. The melting point is the temperature at which the solid transitioned into liquid. The heat supplied is fully utilised to convert the solid into the liquid state at the melting point of the solid. Thus its temperature does not rise.
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