实验材料:蜡烛、盘子、玻璃杯、火柴、水。实验过程:1、将点燃的蜡烛固定在盘子中间。2、向盘内倒入少量水(可滴两滴红墨水)　(图1)。3、用高于蜡烛的玻璃杯罩住点燃的蜡烛。注意看,水被吸进杯中一截(图2)。说明道理:蜡烛燃烧时需要氧气,杯中的氧气被蜡烛消耗尽了,蜡烛就灭了, Experimental materials: candles, plates, glasses, matches, water. Experimental process: 1. Fix the lit candle in the middle of the dish. 2. Pour a small amount of water into the pan (a drop of two drops of red ink) (Figure 1). 3. Cover the lit candle with a glass above the candle. Note that water is sucked into the cup (Figure 2). Explain the reason: When the candle burns, it needs oxygen, the oxygen in the cup is consumed by the candle, and the candle is gone.