Re: Supercooled liquid water can occur in clouds below 0 degrees C.

From: Rodney Blackall (rblackall_at_rodsrisc.demon.co.uk)
Date: 08/01/04 

Date: Sun, 01 Aug 2004 21:24:51 +0000 (GMT)

In article <2n4c8sFsn1n1U1@uni-berlin.de>,
   Phred <ppnerkDELETETHIS@yahoo.com> wrote:
> In article <4cd74dcfffrblackall@rodsrisc.demon.co.uk>,
> G'day Rodney,
> I'm curious about this -40C stuff. Is there actually some physical
> phase change or whatever involved here, or is it just a convenient
> rule of thumb not to be taken too literally?

On the temperature / pressure / phase diagram the option for water to
exist seems to to squeezed out at -40. I don't think it has anything to do
with -40 deg C = -40 deg F! But it IS helpful in remembering.

As a matter of interest there are several different types of ice, as
pressure reaches the megabar range all sorts of queer things happen. 

-- 
Rodney Blackall (retired meteorologist)(BSc, FRMetS, MRI)
Buckingham, ENGLAND
Using Acorn SA-RPC, OS 4.02 with ANT INS and Pluto 3.03h