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प्रश्न
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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उत्तर
The temperature of both boiling water and steam is 100°C but steam has more energy because of latent heat of vaporisation. Hence, steam is hotter than boiling water.
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संबंधित प्रश्न
Explain the terms boiling point.
A liquid can change into vapour state at a fixed temperature.
Describe an experiment to demonstrate that water absorbs heat during boiling at a constant temperature.
How is the boiling point of water affected when some salt is added to it?
It is difficult to cook vegetables on hills and mountains. Explain the reason.
A pressure cooker is based on the principle that boiling point of water increases with the ______.
What is the physical state of water at 100°C.
The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called ____________.
Why does the temperature of a substance remain constant during its melting point or boiling point?
Assertion (A): No-new substance is formed when water is heated to get steam.
Reason (R): Conversion of water into steam is a physical change.
