Volume Meter: This meter measures the volume of the gas inside the ideal gas container. You must attach the volume meter to a red hotspot on the container (see Container (Ideal Gas)).

Only the probe connects to the hotspot on the container. The meter itself appears to the left. You can move the meter, but you cannot delete it. To delete the meter, you must delete the probe.

You must place a volume meter to plot volume using the graph tool.