Question

air weighs less than water ;will the pressure exerted by the water will be greater thann the pressure exerted by the same volume of air.give reasons to support ur answer.

Answer 1

Pressure exerted by water or air may be found by knowing its weight and dividing that by the surface area on which they are putting pressure.

Pressure =  Weight / surface area  = volume * density / surface area

If volume and surface area are constant, then pressure is directly proportional to density.  As water is of higher density, it exerts more pressure.