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GCSE Physics · key term
The pressure produced by the weight of the liquid above a point.
Used by AQA, Edexcel and OCR
Specification 4.5.5.1.2 · Paper 2
The pressure caused by the weight of the liquid column above a point.
Revise: Pressure in a fluid 2Consider an object that is partly or completely submerged. Its lower surface is deeper than its upper surface, so the liquid pressure on the bottom is greater than the pressure on the top. Pressure acting over a surface produces a force, making the upward force on the bottom greater than the downward force on the top.
Specification 15.14P · Paper 2
Do not say that pressure acts only upwards. Liquid pressure acts normally to every wetted surface; the pressure difference produces an overall upward resultant.
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Specification P1.3i · Paper 1 (Foundation), Paper 3 (Higher)
The force exerted normally per unit area by a liquid on a surface in contact with it.
Revise: Pressure in liquidsA liquid exerts pressure on every surface it touches, and the force due to that pressure acts normally—at right angles—to the surface. This means that liquid pressure can produce sideways and upward forces as well as downward forces.