Fluid Pressure

1. Fluid Pressure

2. Pressure • Pressure is equal to the force exerted spread out over an area • Pressure = Force --------- Area

3. Pressure in Fluids • Fluid—liquid or gas • Pressure in a fluid increases as depth increases • Pressure in a fluid at any depth is constant, it pushes equally in all sides

4. This is why when you swim to the bottom of the pool your ears hurt—too much pressure

5. Or when you are in an airplane your ears will pop—too little pressure

6. Atmosphere and the air pressure • You live at the vast ocean of fluid • Air pressure decreases as altitude increases

7. Pascal’s Principle • Change in pressure at any point in a fluid is transmitted equally and unchanged in all directions throughout the fluid

8. Hydraulic Systems • In a hydraulic lift system, an increased output force is produced because a constant fluid pressure is exerted on the larger area of the output piston

9. Bernoulli’s Principle • As the speed of a fluid increases, the pressure within the fluid decreases

10. More lift on bottom, pressure on top is lower

11. Spray bottle