What is the speed of a falling raindrop ? गिरने वाली वर्षाबूंद की गति क्या है?

 What is the speed of a falling raindrop ?

It depends on the size and weight of the raindrop how fast it falls: the heavier, the faster. At sea level, a large raindrop about 5 millimeters across (house-fly size) falls at the rate of  9 metres per second(20 miles per hour). Drizzle drops(less than 0.5 mm across, i.e., salt-grain size) fall at 2 metres per second (4.5mph).

A raindrop starts falling and then picks up speed because of gravity. Simultaneously, the drag of the surrounding air slows the drop's fall. The two forces balance when the air resistance just equals the weight of the raindrop. Then the drop reaches its terminal velocity and falls at the speed until it hits the ground. This simple view neglects updrafts, downdrafts, and other complications.

The air resistance depends on the shape of the raindrop, the cross-sectional area presented to the airflow, and the raindrop's speed. Most drops are fairly round- the small ones spherical, larger ones flattened on the bottom by the airflow. At high speeds, the air resistance increases with the square of the velocity.

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