How Do Gas Molecules Behave? Gas molecules are free to move to fill the entire space of their container. These Molecules collide with one another and with anything else they come in contact With, causing pressure. When samples of gases are placed in containers, it is Possible to measure the relationships between gas pressure, temperature, and volume. Do Now: Using the combined gas law formula (table T) and Avogadro’s law, complete the following problems and thought questions. Pair-share your answers with another student in the classroom. A sample of nitrogen gas is contained in a piston with a freely moving cylinder. At 0.00C, the volume of the gas is 375 mL. to what temperature must the gas be heated to occupy a