Sunday 8 November 2015

Rain Drops are Spherical

Why does the rain drops are spherical??

Answer:: The property which is responsible for this is surface tension.

Surface Tension is defined as the force acting over a unit length

For a given volume only sphere has the minimum surface area compared with other geometries.

The cohesive forces which are present between the molecules will tend to occupy a minimum surface area because of which there exists a pressure difference between the inner and outer molecules of the surface which can be calculated as ∆P=4T/r, T is the surface tension and r is the radius of the drop.

The drops generally of 1mm radii are spherical in shape and bigger drops tend to flatten on the gottom and curved on the top, this is due to air drag due to friction

The size of rain drops generally vary from 0.02 inch to 0.33 inch in thunderstorms.

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