Using the Fire Syringe also known as a Fire Piston to compress air into a smaller volume is a classic example of how rapidly doing work on a gas results in an increase in temperature.Once you have inserted a small piece of combustible cotton fibre into the syringe piston a quick firm stroke on the piston handle produces a flash in the chamber which burns as long as there is air present.The Fire Syringe comes with combustible fibre and 2 replacement O-rings for the piston.