Warm snow?

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Warm snow?

#1  Postby Sityl » Jan 03, 2013 2:25 pm

If you could make a lower atmospheric pressure, could you have warm snow? Would it require negative pressure, and if so, how much would be required? Would it kill us, or could we conceivably roll around in warm snow?
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Re: Warm snow?

#2  Postby campermon » Jan 03, 2013 2:46 pm

I'm not sure how atmospheric pressure affects snow formation, but it does affect boiling T i.e. less pressure leads to a lower boiling T.

I would hazard a guess that lower pressure would lead to a lower freezing point. For no particular reason though!
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Re: Warm snow?

#3  Postby JoeB » Jan 03, 2013 2:55 pm

http://www.lsbu.ac.uk/water/phase.html

That link contains some interesting graphs. Basically there is some sort of 'warm' ice of 20 degrees C etc. Pity it requires pressures in the order of ten thousand atmospheres :lol:
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Re: Warm snow?

#4  Postby campermon » Jan 03, 2013 3:16 pm

JoeB wrote:http://www.lsbu.ac.uk/water/phase.html

That link contains some interesting graphs. Basically there is some sort of 'warm' ice of 20 degrees C etc. Pity it requires pressures in the order of ten thousand atmospheres :lol:


:lol:

If I'm interpreting the graph correctly, lower pressure leads to a lower melting point and the ice sublimates straight to a vapour.

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http://www.lsbu.ac.uk/water/phase.html
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Re: Warm snow?

#5  Postby Animavore » Jan 03, 2013 3:18 pm

All I know is I was told not to eat it.


That is interesting, though. :popcorn:
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Re: Warm snow?

#6  Postby campermon » Jan 03, 2013 3:31 pm

Animavore wrote:All I know is I was told not to eat it.


That is interesting, though. :popcorn:


:lol:

I just wish we'd get some bloody decent snow here in the UK. The last time I saw proper snow here in the midlands was when I was a kid in the 80's. :nono:
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Re: Warm snow?

#7  Postby Animavore » Jan 03, 2013 3:35 pm

Same here. And because I live by the sea it's even harder to get decent snow while the midlands are covered sometimes.
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Re: Warm snow?

#8  Postby Sityl » Jan 03, 2013 3:36 pm

We've got tons of it here in NY. I want to be able to roll around in it without it being cold! :( (or yellow)
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Re: Warm snow?

#9  Postby campermon » Jan 03, 2013 3:46 pm

Sityl wrote:We've got tons of it here in NY. I want to be able to roll around in it without it being cold! :( (or yellow)


Bugger!!

As for warm snow - I'm sure that some compound could be created to form a snow at higher temperatures. Not sure if it's be non-toxic though!
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Re: Warm snow?

#10  Postby HughMcB » Jan 03, 2013 3:51 pm

Snowing all day here, if my Tapatalk app was logging into RatSkep like it should I'd upload a picture.

As for the best way to get warm snow, well I would imagine not using H2O would be a start.
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Re: Warm snow?

#11  Postby scott1328 » Jan 03, 2013 4:00 pm

Anyone ever read Cat's Cradle? Ice IX is the answer
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Re: Warm snow?

#12  Postby CdesignProponentsist » Jan 03, 2013 4:37 pm

At higher pressures you can have amorphous room temperature ice. Unfortunately (or I should say luckily) it is at pressures far above the pressures found at the bottom of the oceans and has a different crystalline structure than normal ice.

http://www.pnas.org/content/108/19/7685.abstract

Then there is Kurt Vonnegut's Ice Nine which unlike the real Ice IX is stable at room temperature and causes any water it touches to form into the same structure. Yikes! :(

http://en.wikipedia.org/wiki/Ice-nine
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