Wired:

I guess it’s a mixture of boredom from staying home in the super-cold weather and access to the internet that causes this problem. What problem, you ask? The countless videos of people throwing boiling water out into the Arctic cold air during the polar vortex. OK, I’ll admit—it also looks really cool.

People have been doing this for years and it’s a lot of fun. But do you know the science behind it?