Physics (AS & A Level) · May / June 2016 · Paper 13 · Question 15

For a change in depth Δh in a liquid of density ρ, the change in pressure Δp is given by Δp = Δhρg where g is the acceleration of free fall. What is the equation, or principle of physics, used in the derivation of this formula?

1. Aatmospheric pressure decreases with height
2. Bchange in gravitational potential energy = mass × gΔh
3. Cρ = mass / volume
4. Dthe density of a fluid increases with depth

As printed in the paper