Mita observed steam coming out of a pressure cooker and wondered whether the water boiling inside it or the steam was at higher temperature. Give reasons for your conclusions.

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Solution

The steam and the boiling water both are at same temperature but steam is hotter than boiling water.This is because of the latent heat of vaporisation of steam.
Boiling point of water is 100⁰ C. At 100⁰C water starts boiling that is it change its state from liquid to gaseous. But this process require some extra energy to overcome the force of attraction between the particles.Thus particles in water vapour have more energy than particles in boiling water.
This energy absorption is not reflected by the increase in temperature that is why it is called latent (hidden) heat.

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Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. comment.

Q. At what approximate temperature will water boil in a pressure cooker ? Give a reason in support of your answer.

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(Assume Temperature of steam more than boiling point of water and pressure standard atmospheric pressure)

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