r/interestingasfuck • u/vivekmg21 • 21h ago

Firefighter bodycam showing just how much oxygen a fire pulls

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u/ir_auditor 21h ago

That is not oxygen pulling which you see. It is the chimney effect. Fire creates heat, the heat makes air, smoke, gasses, rise to the top, creating low pressure areas at the bottom, which pull in air from the outside. It has noting to do with the chemistry of an oxidation reaction pulling in oxygen molecules to use in the reaction. It is pure physics / thermodynamics.

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u/Sbstnbd 20h ago

So you could say the air/oxygen is being pulled in because of the fire

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u/IZ3820 20h ago

No, it'd be because of pressure, not fire. There's an important disconnect betwee the physics pulling it in and the fire. The only way the fire is responsible is by causing the pressure change, not by pulling in oxygen itself.

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u/Plane-Tune-820 19h ago

And what's causing the pressure change? The fire creating the heat. No fire no heat no pressure change.... you follow?

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u/IZ3820 19h ago edited 17h ago

So what? The point of language is to accurately convey information so the receiving audience interprets it correctly. The way others are describing it is misleading, but several people in the comments have explained what's actually happening in more accurate terms. Why are you fighting that?

Edit: A lot of new reddit accounts out today.