Sublime

Tonight we were playing a rousing game of Trivial Pursuit for my mom's birthday and the question was thus: What happens to a solid when it sublimes?

I have never heard this term before. I mean, I have heard of the word sublime, of course, but always as a noun or adjective, but not in this context (as a verb). So I was surprised to hear the answer: that it turns into a gas. Upon further research I found that the exact definition states that not only does the solid turn to gas upon heating without ever liquefying, but it also implies that it then turns back into a solid upon cooling. How have I never heard this before? Then I remember who I had for a chemistry teacher in 10th grade and am no longer surprised.

What I learned: When a solid sublimes, it turns into a gas when heated and turns back into a solid when cooled.