| Particle Speed/Energy Meter: This meter measures the average speed or kinetic energy of gas particles. You must attach the speed/energy meter to an orange hotspot on the Ultrascope (see Ultrascope View (Diffusion)). In the Properties Box of the speed/energy meter, you can choose whether to measure average speed or average energy. You can choose to sample small, medium, or large particles, or particles that are colored blue. See the container help page for details. You must place an average speed/energy meter and choose to measure speed to plot speed using the graph tool. You must choose to measure average energy to plot energy.