Surely firefighters know better than to use water on a battery?
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I wonder, would some quickly deployable heat barrier to surround it that can be filled with water once work? Kind of like dunking it a pool, except kind of backwards in that the "pool" is deployed around it and then filled?
You couldn't build it and get it filled fast enough. Also with a 1k degree battery a lot of that water is boiling off instantly.
I'm not sure how you just build a pool that doesn't leak and can hold the weight of the water...
Is water the best choice for a chemical fire?
Depends on the chemical, but it is an appropriate way to fight a liion battery fire though.
You're fighting thermal runaway. Water is very effective at cooling and helps control the fire and keep the heat down. US DOT recommends water spray.
It absolutely isn't.
But it the most available and least toxic fire suppression, especially on a highway.
Foam is full of PFAS, etc and the cost (in CO2 and money) of air dropping, and having to wash the foam off the highway afterwards - leading to runoff - is huge.
Imagine that happening 100 times per day on American highways (when electric trucks become commonly used).