Pressure in a liquid (p = h ρ g)Higher tier · Triple only
AQA GCSE Physics calculation · part of the free Calculation Climb
The pressure at a depth in a liquid: p = h ρ g (depth × density × gravitational field strength). This is Higher tier and separate (Triple) Physics only.
How to do it — step by step
- p = h ρ g.
- depth h in m, density ρ in kg/m³, g ≈ 9.8 N/kg.
Worked example
Depth 2 m in water, ρ = 1000 kg/m³, g = 9.8 N/kg.
p = 2 × 1000 × 9.8 = 19 600 Pa
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