1. Pascal’s Principle and Pressure with Depth

2. Pascal’s Principle Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container.

3. Pressure Unit is the Pascal (Pa)

4. Example of Pascal Area = 1 m 2 Force = 100 N Area = 0.1 m 2 Force = ?

5. Hydraulics

6. Atmospheric Pressure The atmosphere of the Earth applies a pressure to objects on the surface. This pressure varies from day to day due to meteorological conditions but averages about 101,300 Pa.

7. Under Pressure The average adult has a surface area of about 1.8 m 2. This means the average force on the body due to atmospheric pressure is over 180,000N, which is over 40,000 lbs.

8. Pressure with Depth Pressure increases with depth in a fluid.

9. Example A submersible is designed to descend 1000 m below the surface of the ocean. If the density of the seawater is a constant 1030 kg/m 3, what is the pressure at this depth?