Pressure in Fluids Pressure depends on force and area. If you spread the force over more area, there is less pressure.

Which creates more pressure? 10 cm 20 N Push 10 cm 5 cm 20 N Push 5 cm

Same force over smaller area creates more pressure under the heel. If this woman were to step on you, which part of the shoe creates more pressure? Same force over smaller area creates more pressure under the heel. Force (weight) Force (weight) Area

Pressure in Fluids force Pressure = area Pressure depends on force and area. If you spread the force over more area, there is less pressure. The formula to calculate pressure is: force Pressure = area The S.I. unit that we use for pressure is the pascal (Pa)

What causes fluid pressure? Pressure in fluids is caused by the particles pushing against a surface. Each particle gives a teeny tiny push, but they all add up. The more crowded the particles are, the harder they push. The faster they are moving, the harder they push.

The weight of the fluid causes the pressure! Less Fluid Lower Pressure More Fluid Higher Pressure Because air has weight, and if there is less air above you, then there will be less weight. The weight of the fluid causes the pressure! Is there less pressure or more pressure on top of the mountain? Why?

Plastic bottle sealed at 14,000 feet on Mauna Kea observatory on the island of Hawaii, taken down to 9000 feet and then 1000 where the air pressure is crushing the bottle.

The forces are balanced. You can’t feel the atmospheric pressure because your body fluids push back! The forces are balanced. If air has weight, why don’t we feel the atmospheric pressure? Force out Force in Force in Force out Force out Force out Force in Force in

The weight of the fluid causes the pressure! Less Fluid More Fluid Because water has weight, and if there is more water above you, then there will be more weight. The weight of the fluid causes the pressure! Is there more pressure on the divers or the shark? How do you know?

What part of an iceberg has the most pressure on it? Remember that pressure pushes in all directions so the iceberg is being pushed on all sides, all the way around. Pressure increases as you get deeper!