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Tesla Cybertruck caught fire after hitting a fire hydrant in bizarre crash (electrek.co)

submitted 2 months ago by kirk781@discuss.tchncs.de to c/nottheonion@lemmy.world

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[–] ch00f@lemmy.world 6 points 2 months ago (1 children)

Water turning into steam soaks up an enormous amount of heat. I assume that thermal runaway happens somewhere above 100C, right?

CO2 extinguishers work by displacing oxygen, not by cooling.

[–] nilloc@discuss.tchncs.de 5 points 2 months ago (1 children)

The rapidly expanding co2 does get very cold though. It’s not any different from freezing things with compressed air cans.

I don’t hover, know which would absorb more heat per pound though. Someone who knows more math than I can do it though.

[–] ch00f@lemmy.world 7 points 2 months ago* (last edited 2 months ago)

If I’m reading Wikipedia correctly, it takes 348 Joules of heat to boil a gram of CO2.

Water is 2257 Joules per gram. As long as you don’t need anything cooled under 100C, water is the way to go for cooling. It’s also a hell of a lot cheaper and easier to deal with than liquid CO2.