A group of teens in India decided to try and create a refrigerator that didn't need electricity - so that vaccines could be transported to remote locations.
After much trial and error, they found that using ammonium hydroxide as their salt component met their need and could keep a temperature just above freezing.
And then they added some additional salts and were able to get below freezing and remain that way for some time.
There's a cool (ha!) bit of physics involved her where ions are released when the salt is added to water and the net result is an endothermic reaction.
https://www.businessinsider.com/teens-win-earth-prize-built-salt-powered-refrigerator-2025-4
https://www.businessinsider.com/teens-win-earth-prize-built-salt-powered-refrigerator-2025-4
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