1. Explaining the relationship between pressure & volume…
Boyle’s Law
Explaining the relationship between pressure & volume…

2. Boyle’s Law
Robert Boyle was among the first to note the relationship between pressure and volume of a gas.
He measured the volume of air at different pressures, and observed a behavior pattern that led to his law.
During his experiments temperature and amount of gas weren’t allowed to change

3. Pressure (P)
The pressure of a gas is the force exerted on the wall of the container a gas is trapped in.
There are several units for pressure including:
atmospheres (atm)
millimeters of mercury (mmHg)
Pascals (Pa) or kiloPascals (kPa)

4. Effect of Pressure on Volume Boyle’s Law1 3
1 atm 1 3
2 atm 5
5 atm 5 5 3 1

5. Boyle’s Law
P1V1 = P2V2
Example: A gas has a volume of 3.0 L at 2 atm. What is its volume at 4 atm?

6. determine which variables you have:
P1 = 2 atm
V1 = 3.0 L
P2 = 4 atm
V2 = ?

7. V2 = 1.5L 2) Rearrange the equation for the variable you don’t know
P1V1 = V2 P2
3) Plug in the variables and calculate:
(2.0 atm)(3.0L) = V2
(4atm)
V2 = 1.5L