|MadSci Network: Physics|
Hello Donald, Yes it does. The classic example taught in school is an ice skate. The pressure from the skate causes a thin film of ice to melt. The liquid water layer reduces the friction so the skater can go faster. This is something that is peculiar to water. If you look up the density of water vs temperature, you will find the maximum density is at 4 degrees centigrade. Solid water or ice increases in volume as it gets colder. This is the reason that antifreeze is used in heating systems. If the water solidifies the expansion in volume will burst the pipes. The effect of pressure is much greater when water boils. This is because the change in volume upon vaporization is much greater than the change in volume during solidification. Auto cooling systems use pressure to operate at higher temperatures than are possible at atmospheric pressure. Now that the weather is getting more like December here in the NorthEast, you might want to go try a physics experiment. Get some ice skates and check it out! Happy Holidays Bob Novak Specialist, Process R&D Carpenter Technology
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