November 4, 2011

5.12 Gas Molecules

5.12 Recall that molecules in a gas have a random motion and they exert a force hence a pressure on the walls of the container

Watch the video below:

When a gas is introduced to the container the gas particles colldie with all the walls of the container; when particles collide with the wall attached to the needle they have enough force to push the wall and in turn move the needle. The needle on the meter is measuring pressure; as the gas particles collide with the walls they apply a force on the walls, These walls have a surface are, so we can measure the pressure because p=F/A

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