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实验材料:两只玻璃杯、蜡烛、吸墨纸火柴。实验步骤:1.在空玻璃杯中点燃一支蜡烛。2.在杯口覆盖一张蘸了水的吸墨纸。3.把同样大小的玻璃杯倒扣在这个玻璃杯上。几秒钟之后,你会发现玻璃杯中的蜡烛熄灭了。当你想要拿起上面的玻璃杯时,两个玻璃杯也连在一起了。实验揭秘:由于吸墨纸是透气的,所以蜡烛一直燃烧到两个玻璃杯中的氧气消耗完。一部分燃烧并膨胀的气体外溢出去了。火焰熄灭以后,玻璃杯中的气体迅速冷却并萎缩。于是,在两个玻璃杯中产生
Experimental materials: two glasses, candles, blotting paper matches. Experimental steps: 1. Light a candle in an empty glass. 2. Cover the mouth with a piece of blotting paper dipped in water. 3. In the same size glass inverted buckle in the glass. After a few seconds, you will find the candle in the glass goes out. When you want to pick up the glass above, the two glasses are also connected together. Experimental Secret: Since the blotter is breathable, the candle burns until the oxygen in the two glasses is consumed. A portion of the burning and expanding gas spilled out. After the flame is extinguished, the gas in the glass rapidly cools and shrinks. So, in two glasses