The graph alongside represents a cooling curve for a substance being cooled from a higher temperature to a lower temperature.
Why is the region $D E$ shorter than the region $B C$ ?

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Solution

$B C$ represents the change of state from vapour to liquid. So this is the region during when latent heat of vaporization is required. During $D E$ the change takes place from liquid to solid where latent heat of fusion is required. Since latent heat of fusion is less than the latent heat of vapourization. Therefore, $D E$ is shorter than $B C$ .

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The graph alongside represents a cooling curve for a substance being cooled from a higher temperature to a lower temperature.Why is the region DE shorter than the region BC?

The graph alongside represents a cooling curve for a substance being cooled from a higher temperature to a lower temperature.
Why is the region $D E$ shorter than the region $B C$ ?