1. The problem statement, all variables and given/known data A syringe contains gas at the same pressure as the air outside. The piston moves freely along the cylinder without any friction. No gas escapes. As the syringe is heated from 20 degrees to 100 degrees the piston moves outwards. It stops moving when the temperature is steady. State how the value of each of the following quantities compares at 100 degrees, after the piston stops with its value at 20 degrees. average distance - increased pressure after it stops - same average speed of gas - increased frequency of collisions of the gas on the piston - same 2. Relevant equations none 3. The attempt at a solution i don't understand why the frequency of collision of the gas on the piston remains the same. Since at 100 degrees the pressure is the same as it was previously so shouldn't the frequency of collision be the smaller as average speed of gas increases, in order for the pressure to remain the same the frequency of collision must be smaller? thanks for the help!