Science Questions

Why don't your eyeballs freeze?

Sun, 22nd Jul 2007

Listen Now    Download as mp3 from the show Extreme Survival


Alan, Orpington asked:

Eyeballs are full of liquid, so how do they not freeze in extreme temperatures?


[We put this question to David Thomas, author of ‘Surviving Antarctica’]

Because your eyeball is contained within your head, and your head is kept at body temperature, it never gets cold enough to freeze.  The eyeballs in a dead body would indeed freeze, but while you’re alive and radiating heat it can’t.  Even tears wont freeze immediately, as they are very salty, and salt reduces the freezing point.


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