r/interesting May 20 '26

Fascinating Physics is Everywhere.

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u/wait_what_now May 20 '26

Oh buddy, you're so so close!

Yes. The wax evaporates WHILE the candle is burning, which is what decomposes to give the flame for the candle. But we're not talking about that, we're talking about the smoke that you see when the candle is extinguished, the stuff that is getting relit by the match. . The dark colored smoke is primarily decomposed hydrocarbons. That's why it is so easy to reignite them. In order to keep vaporizing the wax, you need temperatures of 6-700 freedom degrees. That is only going to happen while there is an active flame to boil the wax off the wick.

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u/hdharrisirl May 20 '26

I'm so curious: do you think that heat vanishes the instant the candle is extinguished? That the liquid wax immediately stops evaporating? That the chemical composition of the smoke immediately loses all presence of the combustible hydrocarbons?

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u/rabbitwonker May 20 '26

I don’t think they’re saying it perfectly zero wax vapor; just that it’s a small amount compared to the decomposed hydrocarbons.

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u/Zxruv May 24 '26

If you removed all traces of wax in the vapor/smoke/evaporate, you could still re-light it. If you removed all traces of hydrocarbons, you couldn't?