1. What is Pressure?
To create the most pressure,
which shoes should be worn?
P = F A
Gas pressure is caused by _________ with the _____ of the container.
Like density
collisions
P = F A
P = F A
walls

2. (weight of air) measured with a barometer
empty space
(a vacuum)
weight of Hg h
760 mm
Atmospheric Pressure
(weight of air) measured with a barometer
Atmospheric Pressure:
weight of air per area
(14.7 psi) psi -> pounds per square inch

3. You can’t drink through the straw (in a closed container) unless the atmosphere pushes the liquid.
WHY no flow?

4. 1 atm 760 mmHg 760 torr 101.3 kPa 14.7 psi 1 Pascal =
Standard Atmospheric Pressure (atm)
Units at Sea Level:
1 atm
760 mmHg
760 torr
101.3 kPa
14.7 psi
Same pressure as a large truck in one inch
1 Pascal =
1 Newton of force
1 m2 of area

5. # of Particles Volume Temp Particles ... Volume ..… Temp .…….
(collisions)
Pressure
Particles ...
Volume ..…
Temp .…….

6. Quick Quiz! 1) Gas pressure is affected by…
A) temp, volume, and molar mass.
B) temp and number of particles.
C) volume and size of container.
D) temp, volume, and # of particles. 6

7. Quick Quiz. 2) If 1 atm = 760 mmHg, then how many atm is 747 mmHg?
A) 567,720 atm
B) atm
C) atm
747 mmHg x 1 atm =
760 mmHg 7