January 17, 2022, 08:04:57 PM
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Topic: Why is soot refusal to ignite and why is it resistant to burning?  (Read 287 times)

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Offline Krzychu

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Hello, I have a question why the soot in this film does not catch fire and in general why is the soot very resistant to burning?

https://www.youtube.com/watch?v=_WtTag3Nm9Q&t=15s

Offline jeffmoonchop

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Re: Why is soot refusal to ignite and why is it resistant to burning?
« Reply #1 on: November 29, 2021, 11:48:13 AM »
isnt soot the remains of something that has already burned?

Offline Borek

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Re: Why is soot refusal to ignite and why is it resistant to burning?
« Reply #2 on: November 29, 2021, 12:36:59 PM »
isnt soot the remains of something that has already burned?

No, it is mostly carbon.

It does burn, but because it doesn't contain volatile fractions it is quite difficult to ignite. A bit like coke or char - once it is really hot and in mass it burns quite nicely and is capable of sustaining the required temperature, but getting there (especially with low temperature flame) is not easy.
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Offline Krzychu

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Re: Why is soot refusal to ignite and why is it resistant to burning?
« Reply #3 on: December 03, 2021, 08:57:05 AM »
You don't want to burn at high temperature and oxygen availability.

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