Pressure and Depth

2 marks · Easy

State the equation that links pressure difference, height, density, and gravitational field strength. Explain what each symbol means.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

p = h × ρ × g; p: pressure difference, h: height, ρ: density, g: gravitational field strength

Must show: symbols defined

Also accept: p = hρg or words to same effect

Common mistakes: Mixing up symbols or definitions

Show mark scheme and worked solution

Marking points

B1 · 1 mark · Correct equation stated: p = h × ρ × g

B2 · 1 mark · All four symbols defined correctly (p = pressure difference, h = height, ρ = density, g = gravitational field strength)

Worked solution

The equation is p = h × ρ × g.

p is pressure difference, h is height (depth difference), ρ is density, g is gravitational field strength.