Liquid nitrogen (boiling at -196 C) is a semi-common substance that people would have heard of, though not everyone would have seen or interacted with it.
I've seen liquid nitrogen, briefly, as it was sprayed out of a hose. It immediately boiled into a (quite cold) gas, of course. I was told not to play with it too much because they would have to evacuate the building. Oh the joys of "bring your kid to work" days in manufacturing facilities
That's the example Copilot used when asked to make a list of temperatures in 50 C steps with an example or two of something around that temperature that people might have heard of. Also cryogenic freezing of biological samples.
