Bath candle supplies: a candle with a length of 15cm, a candle base with nails or waterproof tape, a box of matches, a glass bowl and a pair of scissors. When my parents and I were doing this experiment, we found that the most difficult part of this device was how to fix the candle at the bottom of the bowl, but the candle would not loosen when adding water to the bowl. If you can't find a candle base with nails or waterproof glue, you can light the candle first, then add water, and drop the melted wax liquid in the center of the bowl bottom, so that the area of this small hollow wax liquid is larger than the wax.

The bottom of the candle is bigger. Then quickly stick on the candle and let the wax cool and harden. Stick the candle firmly with waterproof tape to fix it firmly at the bottom of the bowl. Add cold water to the bowl so that the water level just reaches the edge of the top of the candle. Straighten the candle core, light it and wait. Uncover the mystery: a very thin wax wall will be produced during the experiment, which makes it impossible for water to immerse in the extinguished flame. When burning, because water absorbs a lot of heat, the outermost layer of the candle cannot be heated and burned. If you wait patiently, this underwater candle will become a thin empty pipe. This article comes from the primary school teaching resource network. Please indicate the source address in the form of a link:/zjms/lw/200811/4644.html.