A sample of gas is contained in a cylinder, with a piston which can move up and down to change the volume available to the gas. You can observe the effects of changing the volume, temperature, and number of gas molecules on the other variables. A few of the moving molecules are colored; whenever one of the colored molecules hits the face of the piston, it makes a sound. The more force it exerts on the piston, the higher the pitch of the sound. The pressure in the cylinder increases as the sounds become more frequent or higher in pitch.
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