Pressure – Force per unit area
The larger the force, the more pressure The smaller the area, the more pressure
Everyday applications:
- A sofa has more pressure than an empty box.
- Heels have more pressure than flats on the floor.
Pressure in fluids / liquids
- Pressure increases with depth.
- Pressure acts in all directions. For a submarine this means that pressure is being exerted equally on all parts of the hull.
- Pressure increases as density increases.
- Pressure doesn’t depend on the shape of container. The pressure at any particular depth is the same whatever the shape or width of the container.
Air Pressure
- Air pressure in the atmosphere acts in all directions.
- Air pressure gets less as you rise up through the atmosphere. The atmosphere is denser at lower levels.
- Measured using a barometer.