Boyles Law

1
Boyles Law

• Science 9
• Mrs. White
• Wheeling Park High School

Robert Boyle 1621 - 1691
2
Boyles Law Defined

• Temperature is constant
• Volume occupied by a gas varies inversely with
  the applied pressure
• Equation
• P1V1 P2V2

3
P T V
Inverse Relationship
Reminder Boyles Law has constant temp.

• If P , then V
• If P , then V

4
Pressure 1 / Volume

• Pressure is inversely proportional to volume

5
Solving Word Problems

• Step 1. Write given information.
• Example
• P1 1 atm
• V1 40 mL
• P2 2 atm
• V2 ?

Problem If the original pressure of a gas is 1
atm with a volume of 40 mL, what is the new
volume when the pressure is increased to 2 atm?
6
Solving Word Problems

• Step 2 Use given information to determine what
  equation to use.
• Example
• P1V1 P2V2

Given Info P1 1 atm V1 40 mL P2 2
atm V2 ?
7
Solving Word Problems

• Step 3 Isolate the missing variable by
  re-arranging the equation
• Example Isolate V2

Boyles Law Equation
P1V1 P2V2
P1V1 P2V2
P2 P2
8
Solving Word Problems

• Step 4 Plug-in the given values solve.
• Example

(1 atm)(40 mL)
V2
V2
(2 atm)
20 mL V2
9
Good Work!
Congratulations! You finished the first example
problem using Boyles Law.
10
How are you doing?

• Raise your hand if you feel like screaming?
• Dont worry were not finished with Boyles law
  problems.
• Lets try a few more problems together on the
  chalkboard.