Question

Rain drops acquire spherical shape due to .....

Answer 1

the surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.

Answer 2

anything in the universe tries to attain stability or minimum potential energy...... that's the reason the ball moves down a hill when left. Similarly the water drop also tries to attain minimum potential energy and a body attains min potential energy at min surface area exposed..... and the min surface area for a fixed volume is of a sphere