Underwater Fire | Underwater Candle Experiment by Fun Brains

Underwater Fire | Underwater Candle Experiment by Fun Brains

Underwater fire is no trick and no magic. We are also not using any potassium or hydrogen to lit flame underwater. How can it be possible? Well, we are using a normal candle to let the flame glow underwater. Let’s try this fun science experiment and learn the logic. This experiment uses fire and must be performed only under the supervision of an adult.

Try it yourself

You need:

  1. A bowl
  2. A candle
  3. A cutter or a knife
  4. Match box
  5. Water

What next?

Step 1: Cut the candle to match with the height of bowl.

Step 2: Stick the candle inside the bowl to its bottom using wax.

Step 3: Fill the bowl with water until the top of the candle.

Step 4: Once the water settles, lit up the candle.

You will notice that the flame fires the inner part of the candle far below the water but the wax around the flame kept intact.


What is the logic of underwater candle experiment? How can the candle burn even when the water stands above the level of flame? The logic of this science experiment is simple and easy to understand. When the candle burns, the water protects the wax around from melting. We know that the wax melts at a higher temperature and water prevents the temperature at a lower level for the outer cover of wax. However, the inner layer of wax melts and the flame goes below the water level. However, after several minutes, the wax gets pores and the water flows inward. When the wets the candle’s wick, the flame goes off.

If you liked our underwater fire experiment, try our rising water experiment.

Leave a Reply