how do they get dry Ice to freeze?

Question

I understand that dry ice is just frozen co2, but how do they get the dry ice to those extremely low temperatures? I tried googling it but no satisfying answers came up. Can someone explain?

In: 5

Answer 1

By butting it in a compressor. Things don’t freeze just when they get cold. In order to freeze something you need to get the molecules close enough together to from a crystal. You can do this by cooling it down or compressing it.