Heat of Fusion
Name: Miriam K.
Why is the meting point and freezing point of a pure substance the same?
These are just different words to describe the same process, but in opposite directions.
Freezing point -------> liquid to solid
Melting point or Fusion point ------> solid to liquid
It is mostly a matter of the direction of heat flow -- warming up or cooling down. When
heated, the solid acquires enough energy to collapse into a liquid. When cooled down, the
liquid loses enough energy to enable the molecules (sub-units) to form bonds with each
other and become a solid. So, the solid collapses to a liquid -- and reforms to a solid at
the same energy content.
Click here to return to the Physics Archives
Update: June 2012