关键词: 蜡烛燃烧, 密闭容器, 水面上升, 化学因素, 物理因素

Abstract: When a measuring cylinder is covered on a burning candle stand up into the water within a beak,extinguishing of the candle and rinsing up of the water in the cylinder are observed simultaneously.The volume of the water that enters into the inverted cylinder is about 20 percent of the volume of the original gas in it.We analyze the effects of physical and chemical contributed factors on the extinguishment of the candle and rising up of the water theoretically.The ratio of water volume entered into the inverted cylinder to the original gas volume in it contributed by chemical factors is about 3.2% to 7.16%.We attributed the ring up of the water in the cylinder to the contribution of physical factors.The heat from combustion of the candle leads to spilling of the gas out of the inverted cylinder,and pressure differences inside and outside the cylinder would be established after the candle extinguishes due to the lowering of the gas temperature.We set up experiments and measured the ratio of water volume entered into the cylinder after the candle extinguishing to the gas volume in the cylinder considering the contribution of physical and chemical factors respectively.The ratio contributed by the physical factors is from 10.65% to 12.98%,while the ratio contributed by the chemical factors is less than 2%.The rising of the water in the inverted cylinder is contributed by the physical factors.

Key words: burning candle, closed vessel, water rising, chemical factors, physical factors