1. Gas Pressure

2. (force = mass x acceleration)
Area
Pressure =
(force = mass x acceleration)
Units of Pressure
1 pascal (Pa) = 1 N/m2
1 atm = 760 mmHg = 760 torr = kPa

3. 10 miles
0.2 atm
4 miles
0.5 atm
Sea level
1 atm

4. 5.1
The pressure outside a jet plane flying at high altitude falls considerably below standard atmospheric pressure. Therefore, the air inside the cabin must be pressurized to protect the passengers.
What is the pressure in atmospheres in the cabin if the barometer reading is 688 mmHg?

5. Manometers Used to Measure Gas Pressures
closed-tube
open-tube