Then we want to move the piston back this way, and this to continues, okay? Indefinitely. But let's see what happens here. When we have a force and we start pushing with the force this way, what happens to the kinetic energy or the temperature of the particles within this system? Well, when you move this way, pressure increases, volume decreases, and the particles get closer together. They start banging against each other more violently, more frequently.