Each kg of mass is pulled down by the Earth with a force of 10 N. We can then calculate pressure using: pressure = force ÷ area. If you stand on one foot (rather than both feet), the pressure ...

Watch this fascinating demonstration of air pressure at work. Notice how the egg vibrates as the heated air escapes around it, and how it gets smoothly pushed into the bottle by atmospheric pressure.

The density of water is 1,000 kg/m 3. Calculate the pressure exerted by the water on the bottom of a 2.0 m deep swimming pool. (Gravitational field strength = 10 N/kg). A stone is dropped into a lake.