2007-02-15 01:41:21 · 6 answers · asked by mario b 1 in Science & Mathematics ➔ Physics
Gnomon is correct. The phase transformations of water - ice to liquid, liquid to steam - are all pressure dependant. Just as water boils at a lower temperature in Denver than it does in Miami due to the difference in air pressure at altitude, ice under pressure has a lower melting point. Because the area of the skate blade edge is very small, the pressure of the skater's weight supported on such a small area is large enough to change the melting temperature of the ice.
2007-02-15 01:56:07 · answer #1 · answered by Grizzly B 3 · 0⤊ 0⤋
Yes. The pressure lowers the freezing point of water, so that without any change in temperature, the ice melts. As soon as the pressure is released, the freezing point goes back to its normal level and the water refreezes.
There is no friction involved, and the temperature does not change.
2007-02-15 09:51:18 · answer #2 · answered by Gnomon 6 · 1⤊ 0⤋
It's not due to the pressure, its to do with a force they call 'friction'.
Even though the skater limits the amount of friction by having a smooth shrp blade - friction still exists.
It generates a certain amount of heat, just enough to melt the ice, then when the skater has moved on - the water refreezes to ice.
2007-02-15 09:44:52 · answer #3 · answered by Doctor Q 6 · 0⤊ 2⤋
pressure and temperature are directly related. If you increase presure, the temp will also increase. Once the pressure is removed, the temperature will return to "normal"
2007-02-15 09:45:56 · answer #4 · answered by champagne0684 2 · 0⤊ 1⤋
Yes
2007-02-15 09:44:32 · answer #5 · answered by Anonymous · 0⤊ 2⤋
yes indeed
2007-02-15 10:17:32 · answer #6 · answered by s madhavan 1 · 0⤊ 1⤋