Explaining the relationship between pressure & volume…

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Presentation transcript:

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

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

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)

Effect of Pressure on Volume Boyle’s Law 1 3 1 atm 1 3 2 atm 5 5 atm 5 5 3 1

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?

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

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