Analysing & Evaluating Questions
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.
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Answer:
It is because, when water changes into steam, it absorbs latent heat of vaporisation, but when steam condenses to form water, an equal amount of latent heat is given out without changing the temperature. Hence, she felt intense heat from puff of steam gushing out of the spout of the kettle.
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