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1.8 Pressure
1 Define pressure as force per unit area; recall and use the equation
pressure =
force
area
p = F
A
2 Describe how pressure varies with force and area in the context of everyday examples
3 State that the pressure at a surface produces a force in a direction at right angles to the surface and
describe an experiment to show this
4 Describe how the height of a liquid column in a liquid barometer may be used to determine the
atmospheric pressure
5 Describe, quantitatively, how the pressure beneath the surface of a liquid changes with depth and density
of the liquid
6 Recall and use the equation for the change in pressure beneath the surface of a liquid
change in pressure = density × gravitational field strength × change in height
∆p = ρg∆h
