49 Explain the following observations briefly:
(a) A firki does not rotate in a closed area.

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Solution

The air pressure/force applied by air on the blades of the firki causes the firki to move.
There is no or lack of air movement in a contained region, a firki does not rotate.

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49 Explain the following observations briefly:(a) A firki does not rotate in a closed area.

The air pressure/force applied by air on the blades of the firki causes the firki to move. There is no or lack of air movement in a contained region, a firki does not rotate.

49 Explain the following observations briefly:
(a) A firki does not rotate in a closed area.

The air pressure/force applied by air on the blades of the firki causes the firki to move.
There is no or lack of air movement in a contained region, a firki does not rotate.