Each increase in pressure of 100 atm decreases the melting point of ice by about 1.0¡ÆC.
Q. One possible explanation of why a skate moves smoothly over ice is that the pressure exerted by the skater on the ice lowers its freezing point and causes it to melt. The pressure exerted by an object is the force (its mass ¡¿ the acceleration of gravity, 9.8 m s-2) divided by the area of contact. Calculate the change in freezing point of ice when a skater with a mass of 75 kg stands on a blade of area 8.0 ¡¿ 10-5 m2 in contact with the ice.
Is this sufficient to explain the ease of skating at a temperature of, for example, -5¡ÆC (23¡ÆF)?
I don't really know how to approach this question?
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