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From: barryg@sdcrdcf.UUCP (Barry Gold)
Newsgroups: net.physics,net.followup
Subject: Re: More on Cold Bottles of Coke
Message-ID: <771@sdcrdcf.UUCP>
Date: Thu, 5-Jan-84 13:54:10 EST
Article-I.D.: sdcrdcf.771
Posted: Thu Jan  5 13:54:10 1984
Date-Received: Sat, 7-Jan-84 03:28:08 EST
References: <134@cubsvax.UUCP> <631@houxz.UUCP>
Reply-To: barryg@sdcrdcf.UUCP (Barry Gold)
Organization: System Development Corporation, Santa Monica
Lines: 11

There is more involved in ice skating than just the effect of pressure on
the freezing point of water.  Normal ice found on ponds, etc. is ice I
("ice one").  A relatively small amount of pressure will convert it to ice
II. (By relatively small, I mean an automobile tire - while the weight is
much larger, the surface area is enormously larger than a hollow-ground ice
skate).  Ice II has a melting point several degrees lower than ice I and
consequently melts.  Heat loss to the surrounding ice I and air will
rapidly freeze it again, but meanwhile the skater gets hiser low friction
surface. (As does the unfortunate fellow without chains on his car.)

barry