Boyle’s Law. What are the 4 variables that describe a gas phase system? Volume Temperature Pressure Amount of gas (in moles)

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Presentation transcript:

Boyle’s Law

What are the 4 variables that describe a gas phase system? Volume Temperature Pressure Amount of gas (in moles)

Fixed Mass? You don’t change the number of moles of gas. Don’t add or remove any gas.

BOYLE Temperature and Amount are constant. Look at relationship between P and V. What happened when I increased the pressure on the syringe? As pressure increases, volume decreases.

Image From Tiger Boyle’s Law: 4 step J-Tube experiments

Can you explain …. GasVol.mov Popcane.mov

TrialPressure (atm)Volume (cm 3 )

Scientists plot data because a picture shows relationships better than lists of numbers. There are lots of “pictures” that scientists & mathematicians recognize.

Inverse Relationships Graph of 2 variables is a hyperbola.Graph of 2 variables is a hyperbola. Properties:Properties: Relationship is inverse.Relationship is inverse. Product of the 2 variables is a constant.Product of the 2 variables is a constant.

TrialPressure (atm) Volume (cm 3 ) Pressure  Volume (atm-cm 3 ) For a given T and amount, pressure X volume always equals the same number – the product is CONSTANT!

ComparisonPressure Change Volume Change Trials 1 & 2 1 to to to 1 Trials 1 & 3 1 to to to 1 Trials 1 & 4 1 to to to 1

Boyle’s Law - words The volume of a sample of gas is inversely proportional to its pressure, at constant temperature.The volume of a sample of gas is inversely proportional to its pressure, at constant temperature.

Boyle’s Law - mathematically P X V = K, a constant V = K/P or P = K/V P 1 V 1 = P 2 V 2 For every point on the hyperbola, P X V = the same constant, K