Pressure in Liquids and Gases

1 mark · Normal

State what is meant by 'pressure at a point acts equally in all directions in a liquid at rest'.

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Pressure at a point in a liquid at rest is the same in every direction.

Also accept: The pressure is the same in all directions at a point in a stationary liquid or gas.; In a liquid or gas at rest, pressure at a point is the same in every direction.

Common mistakes: Only mentions up/down, not all directions; Confuses with pressure increasing with depth

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Marking points

B1 · 1 mark · Correct statement that pressure acts equally in all directions at a point in a liquid or gas at rest.

Worked solution

At a given point in a stationary liquid, the pressure is the same in all directions—upwards, downwards, sideways.