1. Pressure and Pascal’s Principle

2. PRESSURE!

3. FORCE

5. Pressure – force per unit area

7. Quick lab. Find the pressure each of your feet exerts on the floor. How would the pressure change if you stood on one foot? How would the pressure change if your weight doubled?

8. Pascal’s Principle Any change in pressure applied to a completely enclosed fluid is transmitted undiminished to all parts of the fluid and the enclosing walls

11. Compare work??? Compare distance traveled by each piston? Download Pascal worksheet from the website

12. Practical use: A bottle of juice is sealed under partial vacuum, with a lid on which the red dot or “button” is painted. Around the button the following phrase is printed: “Button pops up when seal is broken”. Explain why the button remains pushed down when the seal is intact.

13. Download gauge pressure worksheet from the website

14. Gauge Pressure Absolute pressure (including atmospheric) Pressure in a fluid at the depth h

17. What is the sub- atmospheric pressure in Pa and atm if the height of the Hg column in the barometer is 690 mm? If the tube were doubled in diameter, what would happen to the height of the column? How tall should a barometer be to measure normal atmospheric pressure if instead of Hg it is filled with water?