Pressure in gasses

in a gas, if temperature is a constant, increasing the volume of a gas means that the particles will get more spread out and hit the walls of the container less often. this means that the gas pressure will be decreased.

pressure and volume are inversly proportional - when one goes down the other goes up. for a gas at a fixed mass and a constant temperature, the relationship is:

PxV=Constant

for example:

a gas was held in a sealed container with a volume of 11 centimetres cubed. And the gas pressure is 84PA. The volume of the container is increased and the gas pressure decreases to 60PA. what is the new volume of the container.

originally: constant = 84x11 = 924

so after the volume is changed: constant = Vx60 = 924

so to get the volume: V= 924/60 = 15.4 centimetres cubed.  

As a class we did an investigation into what different things effect gasses, these are the results:

independent                        dependent                            controls

particles(up)                                pressure(up)                                  volume

temperature(up)                          pressure(up)                                  particles

volume(down)                             pressure(up)                                  particles

gravity(up)                                   pressure(down)                             volume, particles

gravity(up)                                   temperature(up)

in our conclusion we also noticed that the amount of particles does not effect the temperature or the volume. and the temperature also does not have any effect on the volume.