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Lithium is a metal right? Putting water on a metal fire usually just makes the fire worse.
Lithium isn’t just a metal it’s a metal that has a rapid exothermic reaction with water. Or at least that’s what I remember my high school Chem teacher saying.
That's when it's not even on fire, right? Like pure sodium or aluminium (I forget which one combusts in water and which was just the air)?
Pure sodium can react with the moisture in the air. (If I recall correctly).
Aluminium is used in drink cans and is very inert. Aluminium shavings can burn though and they’re difficult to extinguish.
Pure elemental aluminum isn't stable. The aluminum used in cans and such is an alloy and not pure elemental aluminum. My chemistry teacher blew a hole in the ceiling tiles of the classroom when he showed this off. The sodium didn't react nearly as violently (but he also used a much smaller chunk).
Are you referring to the immediate oxidation of the outer layer when exposed to air?
aluminum is stable in the sense that the outer layer oxidizes rapidly and prevents the rest of the metal from reacting with anything. the reason thermite is so exothermic is because of massive amount of surface area provide by the powdered metal. a chunk of aluminum simply isn't dangerous.