Question

1. Hot air balloons gain their lift from the lowering of density of air that occurs
when the air in the envelope is heated. To what temperature should you heat a
sample of air, initially at 315 K, to increase its volume by 25 per cent?​

Answer 1

Answer:

As air is heated, it becomes less dense than the surrounding cooler air. The less dense hot air has enough lifting power to cause the balloon to float and rise into the air.

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