Rain drops are almost spherical. Their diameters rarely exceed 6 mm. Calculate the number of

raindrops that would be required to fill a cylindrical can with volume 355 ml.

Diameter of a rain drop = 6 mm

Radius of a rain drop = 6/2 mm

= 3 mm

Volume of a rain drop = (4/3) * pi * r^3

= (4/3) * (22/7) * 3 * 3 * 3 mm^3

= (4 * 22) / 7 * 3 * 3 mm^3

= (88/7) * 9 mm^3

= 792/7 mm^3

= (792/7) / 1000 ml

= 792/7000 ml

= 99/875 ml

No. of raindrops reqd. = Vol. of cylindrical can / vol. of a rain drop

= 355 / (99/875)

= (355*875) / 99

= 310625/99

= 3137.62

Therefore 3137.62 rain drops are reqd.