TIL that Submarines and Space Stations burn special candles as a means to produce oxygen, which can be used as a backup if their electronic oxygen-producing systems fail.

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Someone watched r/smartereveryday


Submariner: For reasons we couldn’t always run the oxygen generator so burning candles was actually a pretty common occurrence.


Navy used to use them for firefighting…but the funny thing is if you expose them to diesel fuel they blow up. We had to wear them when we were trying to extinguish burning diesel fuel. Fun times.


We use these in mines to. If you become trapped in a refuge chamber and the air supply fails


Interesting. Wonder where you leaned this?