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The graph shows the variation of temperature $(T)$ of one kilogram of a material with the heat $(H)$ supplied to it. At $O,$ the substance is in the solid state. From the graph, we can conclude that
${T_2}$ is the melting point of the solid
$BC$ represents the change of state from solid to liquid
$({H_2} - {H_1})$ represents the latent heat of fusion of the substance
$({H_3} - {H_1})$ represents the latent heat of vaporization of the liquid
Solution
(c) Since in the region $AB$ temperature is constant therefore at this temperature phase of the material changes from solid to liquid and ($H_2 -H_1$) heat will be absorb by the material.
This heat is known as the heat of melting of the solid.
Similarly in the region $CD$ temperature is constant therefore at this temperature phase of the material changes from liquid to gas and ($H_4 -H_3$) heat will be absorb by the material.
This heat as known as the heat of vaporisation of the liquid.
