A body weight 20 N in water and 30 N in a liquid. The actual weight of the body is 40 N, then find the specific gravity of the liquid.

Explanation

Weight of the body in air `W_1` =40N
Weight of the body in liquid `W_3` =30N
Weight of the body in water `W_2` = 20N
`therefore` Specific gravity of the liquid = `(W_1-W_3)/(W_1-W_2)=10/20=0.5