Printer Friendly

Skating on thin water.

There's nothing really simple about skating smoothly across a sheet of ice.

One standard explanation of why skates slide so easily on ice holds that the pressure produced by a skate's sharp blade forces a little of the ice to melt, creating a thin, slippery film of water on which the skate actually glides. But this answer doesn't hold up under close scrutiny. Samuel C. Colbeck of the U.S. Army's Cold Regions Research and Engineering Laboratory in Hanover, N.H., reviews some of the arguments against pressure melting as the cause of the low friction encountered in ice skating and snow skiing in the October American Journal of Physics.

Colbeck argues that the pressure needed to reach the melting temperature of ice would more likely cause the ice to crack and fragment. Even if melting did occur, only an exceedingly thin film of water would be present. "Pure liquid water cannot coexist with ice much below -20oC at any pressure," he adds, "and friction does not increase suddenly in that range." Skating and skiing are still possible below this temperature.

Heating caused by the friction of a skate moving rapidly across the ice represents an alternative mechanism for the formation of a water film to facilitate skating. "This mechanism generates heat at the interface where it is needed, by the shear of the thin water film," Colbeck notes.
COPYRIGHT 1995 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1995, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

 Reader Opinion

Title:

Comment:



 

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:new research on role of surface melting in ice skating
Publication:Science News
Article Type:Brief Article
Date:Oct 21, 1995
Words:229
Previous Article:Setting an antimatter trap.
Next Article:EMDR: promise and dissent: new research enters debate over a highly touted trauma therapy.
Topics:


Related Articles
Ice capades.
Viewing frost heave on a microscopic scale.
Ice's watery surface comes into view.
Ice capades.
Sea Change in the Arctic.
ICE AGE COMING TO VALENCIA ICE STATION SET TO OPEN NEXT MONTH.
Ocean maybe melting ice shelf from below.
Intrepid explorer: an oceangoing rover gathers unprecedented data.

Terms of use | Copyright © 2014 Farlex, Inc. | Feedback | For webmasters