# Physics - Calculating pressure in liquids

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How does pressure in liquid relate to depth?
Liquids exert pressure on objects. The pressure in liquids changes with depth.
The deeper you go:
-the greater the weight of liquid above
- the greater the liquid pressure
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Other factors that affect pressure in a liquid?
Pressure in a liquid explains floating and sinking.
Pressure is exerted on the surface of an object in a liquid (upthrust). An object placed in a liquid will begin to sink.
As it sinks, the liquid pressure on it increases and so the upthrust increases.
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How do you calculate pressure in a liquid?
Calculating pressure in a liquid
p=hpg

pressure(Pa)= height of column(in metres) × density of the liquid(kg/m³) × gravitational field strength (newtons per kilogram N/kg)
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Pressure in gases
Gas pressure is caused when gas particles hit the walls of container. The more the particles hit the walls, and the faster they are moving, the higher the pressure.
A car tyre contains gas under pressure.
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Pressure in air
The pressure of the Earth’s atmosphere varies with altitude.
Key features of the atmosphere are:
-it is thin compared to the size of the Earth
-it becomes less dense as the altitude increases.
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## Other cards in this set

### Card 2

#### Front

Other factors that affect pressure in a liquid?

#### Back

Pressure in a liquid explains floating and sinking.
Pressure is exerted on the surface of an object in a liquid (upthrust). An object placed in a liquid will begin to sink.
As it sinks, the liquid pressure on it increases and so the upthrust increases.

### Card 3

#### Front

How do you calculate pressure in a liquid?

### Card 4

#### Front

Pressure in gases

Pressure in air