why is it easier to measure the freezing point of a substance than its melting point?

Answer 1

because the freezing point remains the same and when the liquid reaches it's freezing point it will almost instantly freeze, where as a solid can be heated past its melting point and it still might not immediately melt, take for instance if you take some water and cool it down to 0 degrees centigrade it will, when it reaches exactly o degrees form ice crystals on the surface of the water, but if you take a ice cube you can put it in the oven and it will mely very quickly at 98 degrees centigrade even though its melting temperature is much lower.

Answer 2

That is contingent upon the substance you are testing. Measuring the freezing point of water for example is quite easy; however, measuring the melting point of lead(pb), might prove to be more challenging.

Answer 3

Notice: The freezing point and melting point of a substance are THE SAME TEMPERATURES! Liquid water freezes to form ice at 0 degrees Celsius (32 degrees Fahrenheit) and ice melts to form liquid water at SURPRISE! 0 degrees Celsius (32 degrees Fahrenheit.

Answer 4

melting point is the same as the freezing point.in the case of water these are equal to 0 deg. celsius.
perhaps for the ease in observation we use the freezing point.

Answer 5

1) It freezes easier than it melts
2) The melting point can be so high that it's difficult to get temperatures high enoug to melt it.

Answer 6

I think it's because it's easier to achieve thermal equilibrium in a liquid (you can stir the liquid with the thermometer or shake the test tube) than in a solid. It's also easier to observe the beginning of the phase change if your liquid starts changing to a solid.

Answer 7

Try sticking a thermometer/temperature probe in an ice cube.

Now try sticking it in water.

Make sense now?