The graph alongside represents a cooling curve for a substance being cooled from a higher temperature to a lower temperature.
What happens in the regions $B C$ and $D E$ ?

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Solution

In $B C$ there is change in phase of substance from vapour to liquid. Heat is released during phase change with temperature kept constant.

In $D E$ there is change in phase of substance from liquid to solid. Heat is released during phase change with temperature kept constant.

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The graph alongside represents a cooling curve for a substance being cooled from a higher temperature to a lower temperature.What happens in the regions BC and DE?

In BC there is change in phase of substance from vapour to liquid. Heat is released during phase change with temperature kept constant.In DE there is change in phase of substance from liquid to solid. Heat is released during phase change with temperature kept constant.

The graph alongside represents a cooling curve for a substance being cooled from a higher temperature to a lower temperature.
What happens in the regions $B C$ and $D E$ ?

In $B C$ there is change in phase of substance from vapour to liquid. Heat is released during phase change with temperature kept constant.

In $D E$ there is change in phase of substance from liquid to solid. Heat is released during phase change with temperature kept constant.