Relating Pressure & Volume Boyle’s Law Robert Boyle 1627 - 1691.

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Presentation transcript:

Relating Pressure & Volume

Boyle’s Law

Robert Boyle

Robert Boyle Irish

Inverse relationship VolumePressure

What happens when you mix nascar and Nasa?

If Pressure of a gas is constant Temperature, Then the Volume of the gas DECREASES Boyle’s Law

If Temperature is constant then the initial product of pressure and volume will = the final product of pressure and volume!

Meaning….

P1V1P1V1 = P2V2P2V2

101.3 kPa kPa V= 2 L V= 1 L InitialFinal =

Units?? kPa 1 atm 760 mmHg Pressure Volume Liters ml

It doesn’t matter which of those units are used as long as they are the same on both sides!!

What happens when you pick your nose too much as a child?

Practice Problem

A balloon has an initial pressure of 1520 mmHg and a volume of 22.4 Liters. After Dallin lets go of the balloon it raises to an altitude where the pressure is 1 atm. What is the new volume of the balloon?

P1V1P1V1 = P2V2P2V mmHg 22.4 L = xx V2V2 1 atm Pressure units are different One must be converted!

P1V1P1V1 = P2V2P2V mmHg 22.4 L = xx V2V2 1 atm 1520 mmHg 1 atm 760 mmHG = 2 atm

P1V1P1V1 = P2V2P2V L = xx V2V2 1 atm2 atm 1 atm V2V2 = 44.8 L

Signs that you may be cut out to be a teacher at a young age.

Charles’ Law Relating Volume & Temperature

Jacques Charles French

Charles’ Law Volume of a gas is constant Pressure, Temperature is INCREASED

Direct relationship Temp.Volume

V1T1V1T1 = V2T2V2T2

Units?? Liter ml Volume Temperature Kelvin C o

It doesn’t matter which of those units are used as long as they are the same on both sides!!

Practice Problem

A balloon has an initial volume of 2 L and a temp. of 273 Kelvin. After Dallin lets go of the balloon it sits next to a light and the temp raises to 400 Kelvin.What is the new volume of the balloon?

Gay-Lusac’s Law Relating Pressure & Temperature

Pressure of a gas is constant Volume, Temperature is INCREASED Gay-Lusac’s Law

Direct relationship Temp.Pressure

P1T1P1T1 = P2T2P2T2

Units?? kPa atm mmHg Pressure Temperature Kelvin C o

It doesn’t matter which of those units are used as long as they are the same on both sides!!

If nothing is constant combine all three laws to form the combined gas law.

P1V1T1P1V1T1 = P2V2T2P2V2T2

OR

P1V1T2P1V1T2 = P2V2T1P2V2T1