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实验材料:两个一样型号的玻璃杯、面巾纸、水、蜡烛、打火机。实验步骤:1.把蜡烛放到一个空玻璃杯里并点燃。2.浸湿面巾纸,覆盖在点燃蜡烛的杯子上。把另一个杯子扣在上面,口对口扣严。3.等蜡烛熄灭以后,拿起上面的杯子。结果发现两个杯子紧紧地连在了一起。原理:面巾纸沾水,可以密闭瓶口。因为面巾纸透气,蜡烛熄灭前已经把两个杯内的氧气耗尽,杯内气压比杯外气压低很多,所以两个
Experimental materials: two identical models of glass, facial tissue, water, candles, lighters. Experimental steps: 1. The candle into an empty glass and light. 2. Soak the tissue, covering the candle-lit cup. Clasped another cup above the mouth, mouth strict buckle. Wait for the candle to go out and pick up the cup above. The results showed that the two cups tightly together. Principle: Mianjinzhi Mo, you can close the bottle. Because the facial tissue is breathable, the oxygen in the two cups has been exhausted before the candle extinguishes, and the pressure inside the cup is much lower than the pressure outside the cup, so two