Pressure & Volume
Published on: Mar 4, 2016
Transcripts - Pressure & Volume
SOLIDS, LIQUIDS AND GASES
How are the molecules/atoms arranged?
Solids: Tightly packed and vibrate
Liquids: Farther apart and can move past each
Gases: Very far apart and collide with one another
KINETIC MOLECULAR THEORY
1) Gases particles are very small compared to
distance separating them.
2) Gas molecules are in constant random motion
and collide with one another and walls of container
= gas pressure.
3) Collisions are elastic- no loss of total kinetic
4) As temp increases so does the speed of the
molecules and the average kinetic energy
Kinetic Molecular theory
BOYLE’S LAW: P-V RELATIONSHIPS
Gases can be compressed.
Decreased volume = increased pressure
Increased volume = decreased pressure
Pressure is the result of the collisions with the sides
of the container.
If container (volume) becomes smaller the
molecules collide with the sides of the container
more often = increased pressure.
Marshmellow pals in a vacuum
P1V1 = P2V2
What would the pressure in a can be if it can deliver
8000 ml of Helium at 1.3 atm and the can has a
volume of 480 ml?
What would the volume of a can be if it can hold
5000 ml of a gas at 100 kPa and the pressure
inside the can is 150 kPa?