1. Boyle’s Law
Pressure and Volume

2. 760 mm Hg = 760 torr = 1 atm = 101.3 kPa = 14.7 psi
Pressure
Pressure = Force / Area
SI unit = Pa = 1N/m2
kPa= 1000 Pa
Pressure of a gas is determined by the kinetic motions of its molecules (each collision exerts a force on the container) po
760 mm Hg = 760 torr = 1 atm = kPa = 14.7 psi
STP: O°C and 1 atm (101.3 kPa)
SATP: 25°C and 100 kPa

3. Barometer Animation
Boyle's Law Activity

4. Boyle’s Law
As pressure on a gas increases, the volume of the gas decreases proportionally, if temperature and amount of gas (moles) remain constant.

6. Pressure & Volume
Atoms inside constantly colliding inside walls = exerting pressure
As atmospheric pressure decreases, there are fewer air molecules to collide with on the outside
So as pressure decreases outside, the inside expands

8. Homework
Pg 425 #1-3
Pg 428 #5
Handout with extra practice available online

9. Plot the Following Data
Volume (L)
Pressure (kPa)
1/P
0.500
818
1.00
411
1.50
273
2.00
205
2.50
164
3.00
137
3.50
117
4.00
101