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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 to a system goes out or the substance is completely used up. In a closed system in which combustion occurs, all of the oxygen within that system is used.
When this occurs the air pressure outside of the glass is greater than the air pressure within the glass because the oxygen has been used up. Even though some new gases are produced, there is still less air pressure inside of the glass than there was originally. Materials: Two little candles or one big one One drinking glass (clear) One saucer Water One lighter or matches Introduction: During combustion, some of the gases inside of the glass are used, which means that the pressure within the glass is now lower than the pressure outside of the glass. Since the air pressure outside of the glass is greater than that of the air pressure within the glass, the water level inside of the glass will rise. The water within the glass rises because the external pressure pushes down on the water with a greater force than the internal pressure does. Suction does not occur during this process because the force from the external pressure pushes the liquid into the glass.
There is nothing inside of the glass pulling the liquid upward. Procedure: Melt a little wax and drip into the middle of the saucer. Place the end of the candle into the wax and allow to harden. Put 30 50 ml of water into the saucer. Light the candle Place the glass over the candle and onto the saucer. Questions: Why does the level of the water rise within the glass?
What cause the flame of the candle to go out? Is the water being pushed or pulled into the glass? Is the air pressure greater inside or outside of the glass? What happens to the air inside of the glass? Conclusion: From this experiment we learned that when the external pressure is greater than the internal pressure the water level within the glass will rise. Due to the fact that the water level within the glass rose we know that the external pressure is 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: Fish, Chuck. Try Thinking Science.
Excuse me, but it s not suction. TTS # 7.
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Research essay sample on Air Pressure Internal Pressure
