It’s Not Suction Purpose: The purpose of this experiment is to show the effects that air pressure has on a liquid and the necessity of oxygen for combustion. Background: When a substance burns it is known as combustion. For combustion to occur oxygen must be present. Once a flame has used all of its oxygen supply it will die, this marks the end of combustion. Combustion stops occurring when the flame supplying the energy …showed first 75 words of 511 total…

…showed last 75 words of 511 total…greater than the internal pressure. This also proves that the combustion that occurred within the glass used up some of the gases causing the internal pressure to be lower than the external pressure. This simple experiment can be used to demonstrate how combustion affects air pressure, the necessity of oxygen for combustion, and how different air pressures will affect a system. Reference: Fabish, Chuck. Try Thinking Science. “Excuse me, but it’s not suction”. TTS #7.