Algodoo

This scene is intended to get insight into the particle-process of heating a gas to increase its pressure.
The heating is simulated by a rotating stick on a motor, which kicks the blue gas-particles.

To measure the pressure, take down the vertical position of the horizontal red bar while the motor is off, for this use the black ruler. Then at higher pressure, you can do it again, so you get the difference of the two lengths, say: dist.
Now multiply dist with 4Newton/m, as this is the spring-constant to get the additional force F, which the faster particles push in average on the horizontal red bar.

To get finally the pressure, just divide F by 9m², as we assume that in reality in three dimensions
we have a quadratic surface of 3m * 3m.

As long as you press the v- or r-button, the motor is driven with the speed, that you can read in the violet box below. To increase or decrease the speed, move the slider with the drag-tool (d) carefully from the middle position ( 0 speed ) to the left or right ( maximal speed ) while the simulation is on.