Question
Define the terms (i) thrust (ii) pressure and (iii) relative density.
Solution
(i) Thrust: The total force acting on a body perpendicular to its surface is called thrust.
(ii) Pressure: Thrust acting per unit on the surface area is called pressure.
(iii) Relative density: The relative density of a substance is the ratio of the density of the substance to the density of water.
Relative density = Density of substance
Density if water at
Since, relative density is a pure ratio, it has no units.
