At 100 C the mean molecular speed is about 17 faster than at 0 C. The speed of molecular movement. Temperature And Particle Motion Tec Science Is random and erratic. . For example Warm objects will have more molecular motion and the cold objects will have less molecular motion. This is because the temperature is the measurement of the average kinetic energy of the molecules and represents the motion of molecules. The higher the temperature the faster the molecules move. Each unit on the Kelvin scale is equivalent to 1 C. Molecular motion is directly proportional to the temperature. Does the mean molecular speed change as much as the temperature as the water heats up. If by some means the gas particles are accelerated to a very high speed in one direction KE certainly increased can we say the gas becomes hotter. A slight change in the Temperature raises the mean molecular speed of molecules. Its speed are p...