[Phoenix-D]

Originally posted by Imperator Fyron:
But not nearly as great as the difference between matter and vacuum.

I'm walking around here occasionally with 1% humidity. That's a really frigging high gradient.

It helps that half the stuff your body does anyway is pump things against gradients. Not as extreme, but in vaccum you'll have other issues anyway. Tack on the layers of skin in between..and diffusion becomes a non-issue.