399
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 30 Aug 2024
399 points (97.6% liked)
Not The Onion
12195 readers
647 users here now
Welcome
We're not The Onion! Not affiliated with them in any way! Not operated by them in any way! All the news here is real!
The Rules
Posts must be:
- Links to news stories from...
- ...credible sources, with...
- ...their original headlines, that...
- ...would make people who see the headline think, “That has got to be a story from The Onion, America’s Finest News Source.”
Comments must abide by the server rules for Lemmy.world and generally abstain from trollish, bigoted, or otherwise disruptive behavior that makes this community less fun for everyone.
And that’s basically it!
founded 1 year ago
MODERATORS
I worked at a lithium ion battery company for 11 years. Water won't do it. When ruptured, a lithium ion battery goes into something called thermal runaway. You need to use CO2 fire extinguishers to cool the batteries to get the fire to stop. Otherwise, it will burn until all the energy is used up. I suppose it's possible to use water that's cold enough to stop the reaction, but I highly doubt it.
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.
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.
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.