Incredibly (and literally) cool: liquid nitrogen in a vacuum

Most of us are familiar with liquid nitrogen; either we’ve seen it at the doctor’s office when we’ve needed a pesky wart removed, or we’ve seen a cryogenics demonstration at a museum or at school or on YouTube where they do such fun things as dip a carnation into it to show how it freezes and becomes amazingly brittle.

But this one will probably be new to you.  It certainly was to me.  Liquid oxygen, placed into a vacuum chamber.  It boils vigorously, of course, but then something surprising happens — followed by something amazing.  The evaporation of N2 cools the remaining liquid enough that it freezes, and *then* it crystalizes, suddenly.  It’s beautiful; check it out!

Advertisements

Leave a comment

Filed under Cool Stuff, Science

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s