Its Not Suction essays

It's Not Suction essays The purpose of this experiment is to show the effects that air pressure has on a liquid and the necessity of oxygen for combustion. 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. 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. - 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. - Place the glass over the candle and onto the saucer. ...