Question

How to prove one-fifth of oxygen in the atmosphere

Answer 1

Answer:

Explanation:

Follow my steps.

1. Take a jar measure it's height and divide it by 5. Now mark the levels according to it,i.e., divide the jar into 5 parts.

2. Take an amount of water in a tray equal to amount of water the jar can hold.

3. Burn a candle on the tray.

4. Invert the jar in it.

Observation:-

Now notice that the candle will get extinguished. And the water level will rise to the level of one fifth of the jar, that is, to the level of amount of oxygen used.