1. Chemistry Notes Unit 7: Intro to Pressure

2. (1) What is Pressure? The force exerted in a given area.
Force for every unit of area.

3. (2) What are the units for Pressure?
“psi” = lbs / in2
Lbs = pounds (force)
in2 = inches squared (area)
“pascal” or “atm” = N / m2
N = newtons (force)
m2 = meters squared (area)

4. (3) Pressure Units Example #1
Using the following relationships…
1 atm = 760 mm Hg
1 atm = 14.4 psi
1 atm = kPa (kilopascal) ______________________________
Convert use factor labeling to convert 320 mmHg to atm.

5. (4) Pressure Units Example #2
Using the following relationships…
1 atm = 760 mm Hg
1 atm = 14.4 psi
1 atm = kPa (kilopascal) ______________________________
Use factor labeling to convert 30.0 psi to mmHg.

6. (5) Factors Effecting Pressure
Volume (V)
Number of Particles (n)
Temperature (T)

7. (6) Pressure Relationships
Linear Relationship:
Both increase, OR, Both decrease
As the “factor” increases….
So does pressure
Equation  division (fraction)
Inverse Relationship:
One increases, One decreases
Pressure decreases
Equation  multiplication