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If hot air rises than why the mountains are always covered with snow?

Posted by Hritik Chaudhary 6 years, 8 months ago

CBSE > Class 12 > Physics

1 answers

Payal Singh 6 years, 8 months ago

When a parcel of air warms up near the surface of the earth, it will rise. But as it rises, it moves into regions of lower pressure. The pressure of the atmosphere drops with altitude, by about 10 kPa (100 millibar) per 1000 m.

As a rising parcel of air moves into regions of lower pressure, it expands. And as it expands, it cools. The air has to do work to expand, and so its temperature must decrease—the only possible source of energy for the work of the expansion is the thermal energy of the gas.

The atmosphere is more complicated, because moisture plays a role. As the air cools, water vapor can condense, giving up latent heat to form snow.

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Posted by Suhani Sharma 1 week ago

CBSE > Class 12 > Physics