| Particle Impulse per Collision Meter: This meter measures the average impulse imparted per collision of gas particles. You must attach the impulse meter to an orange hotspot on the Ultrascope (see Ultrascope View (Diffusion)). In the Properties Box of the impulse per collision meter, you can choose to measure the impulses of small, medium, or large particles, or particles that are colored blue. See the container help page for details. You must place an impulse per collision meter to plot impulse per collision using the graph tool.