Imagine lighting a candle, it glows, and you can see the flame. Now imagine putting a glass jar over it. At first, the flame gets smaller, but then poof! The flame goes out, but if you wait a little, it comes back to life. It looks like it’s burning without oxygen. But how? Well, when the candle burns, it uses up the oxygen inside the jar, that’s why the flame gets smaller. But then the wax starts to change into something else called carbon dioxide, which is like a new gas in the jar. When there's enough of this new gas, it helps the flame burn again, even though there’s no more oxygen.
Examples
- A candle burns inside a glass jar and goes out, but then comes back on its own.
- You light a small fire in a bowl of water, cover it with a cup, and the flame returns after some time.
- A matchstick is lit, covered by a glass, and later sparks again.
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See also
- How Does a Candle Burn for Hours?
- What Causes the ‘Flame’ of a Candle?
- How Do Flames Actually Burn?
- How Does a Battery ‘Run Out’ of Power?
- How Do Bubbles Actually Form?
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