1. Pressure, Bernoulli’s Principle, Compressibility, and Pascal’s Law

2. Pressure Pressure is the amount of force placed on a given area It is measured by the amount of weight divided by the area it is placed on (i.e., pounds per square inch) Pressure is all around us. Air pressure is the weight of the atmospheric particles pressing down on us.

3. Fluid Motion Particles in fluids will always move from an area of high pressure (concentration) to an area of low pressure(concentration) Draw Diagram Above

4. Bernoulli’s Principle Bernoulli’s Principle states that the faster particles move, the less pressure they have.

5. Bernoulli’s Principle (cont.) Applications

6. Compressibility A properties of fluids is that they can be compressed Gasses are more compressible than liquids, because there is more space between the particles Not all fluids can be compressed equally. For example, water is more compressible than oil, which is why oil is used in the brake lines of cars.

7. Pascal’s Law Pascal’s law states that a pressure exerted on a confined fluid is exerted equally in all directions throughout the fluid.

8. Pascal’s Law (cont.) Hydraulic Breaks

9. Hydraulics and Pneumatics Hydraulics are confined systems that require moving liquids to operate. Pneumatics are confined systems that require moving gases to operate.