Pump gas molecules into a box and see what happens as you change the volume, add or remove heat, and more. Measure the temperature and pressure, and discover how the properties of the gas vary in relation to each other. • Describe the behavior of the gas particles in the box. • Identify the relationship between pressure, volume, temperature, and number of gas molecules. • Describe the relationship between particle-wall collisions and pressure. • Predict how changing temperature will affect the speed of molecules.