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Air and Water

Air pressure is less up a mountain - more as you go down

Water pressure is less near the surface - more as you go down

Pressure depeds on depth and density of liquid

Floating--->force on earth>force of water--->force of water depends on pressure difference and area

Pressure

Gas pressure - from molecules colliding so more collisions=higher pressure

Pressure and volume - changing volume changes pressure, or vice versa.

Pressure(Pa)⨉Volume(m³)=Constant Pa=pascals=1N/m²

Atmospheric pressure - if we assume our atmosphere has uniform density, pressure bigger near surface of earth due to weight of air above. atmospheric pressure=100 kPa