1. Pressure
Pressure = Force / Area

2. Barometer
faculty.uncfsu.edu/dautrey/CHEM%20140/chapter10-notes.ppt

3. ]
faculty.uncfsu.edu/dautrey/CHEM%20140/chapter10-notes.ppt

4. Manometer U-tube Manometer
Courtesy Christy Johannesson

5. Manometer

6. Barometer

7. U.S. National Chemistry Olympiad
Manometer
Higanyos manométer:
U.S. National Chemistry Olympiad
1995 National Test
An open-ended mercury manometer is used to measure the pressure exerted by a trapped gas as shown in the figure. Atmospheric pressure is 749 mmHg. What is the pressure of the trapped gas?

8. Pressure Conversions 1 atmosphere (atm) 760 mm of Mercury (mm Hg)
760 torr
Pascal (Pa)
Kilopascal (kPa)
14.7 pounds per square inch (psi)
29.92 inches of Mercury (in Hg)

9. Manometer

10. What does it do - Principles
Manometers
What does it do - Principles a b c
Monitoring Equipment
We will go through the principles of a manometer. Starting with figure a. Here, the manometer is in its simplest form. It is a U-tube about half filled with liquid. With both ends of the tube open, the liquid is at the same height in each leg.
In figure b you can see that when positive pressure is applied to one leg, the liquid is forced down in that leg and up in the other. The difference in height, "h," which is the sum of the readings above and below zero, indicates the pressure.
Figure c shows that when a vacuum is applied to one leg, the liquid rises in that leg and falls in the other. The difference in height, "h," which is the sum of the readings above and below zero, indicates the amount of vacuum. h h
Source: Dwyer Instruments,
© UNEP 2006