Refrigerate Food to Keep it from Spoiling
            - Particles collide with less force
Add inert water to a reaction solution
            - Particles collide less frequently
Compress the air/fuel mixture inside an engine cylinder with a piston
             - Particles collide more frequently
Raise the boiling point of water with a pressure cooker
             - Particles collide with more force
Grind a metal into a fine power
             - Particles collide more frequently