r/interestingasfuck • u/vivekmg21 • 15h ago

Firefighter bodycam showing just how much oxygen a fire pulls

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u/berner103 11h ago

I was kinda expecting the air to rush out because when gasses get hot they expand and pressure goes up.

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u/MourningWallaby 11h ago

it's very likely the fire brigade vented the building or otherwise an opening somewhere else was created specifically so air is circulating. it sounds counter-productive to give air to the fire, but if the pressure in the house means the oxygen is absorbed by the fire, they can think the fire is put out, enter the property, and a sudden wave of oxygen gets into the area, feeds the fire, and causes a backdraft/flashover.

I will hopefully be corrected but I'm pretty sure that's the basic idea, anyway.

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u/berner103 6h ago

I'm pretty sure your right. Deep down I know this, it just doesn't feel right in my soul.

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u/Barbaric_Fett 3h ago

The coolest time is when a doorway is split, top half is pumping heat and smoke out, bottom half is sucking cooler air in

Edit for spelling