At this temperature we get ice fog. Homogeneous nucleation occurs when it's a little lower than -40. This just means that water (even pure water) will freeze all by itself. Normally when it's below freezing water needs something like dust or other ice crystals to form an ice nucleus. Since it's colder than that here, at times we get some of the driest air in the planet; it absolutely cannot hold any moisture at all. Here's the ice fog from this morning:
whoa! that's pretty cool...but, the picture alone makes me chilly!
ReplyDeleteIt is another snowy day here in NH...school is cancelled (again!)
Frostbite on your finger makes us nervous! I hope your car is now cooperating! Good luck with your new semester!
ReplyDeleteLove Dave and Sandi