Difference Between Melting and Freezing Point

Melting point occurs when the substance undergoes a change in its state and turns solid to liquid. Heat is given to the substance.

It completely forms solid when it reaches its freezing point. The substance freezes and melts at the same temperature.

Comparison Table Between Melting and Freezing Point

Parameters of ComparisonMelting PointFreezing Point
DefinitionSolid turns liquid at a particular temperature.Liquid changes to solid at a particular temperature
ProcessThe process is called melting.The process is called freezing.
Heat Supplied from external sourcesTaken away from the substance
VolumeIncreasesDecreases
Internal EnergyIncreasesDecreases
ExamplesSolid to liquid waxWater turns ice

What is Melting Point?

The melting point of the crystalline compounds defines pure compounds and elements of the solid. External sources are required to give heat to the solid so that the heat will raise the temperature of the solid and finally turns into liquid.

The Melting point of the crystalline compounds defines pure compounds and elements of the solid. The internal energy of the solid keeps on increasing when the solid gets heated.

The impurity in the substance affects its melting and freezing temperature. The molecules move more when the temperature rises.

The external pressure is one of the factors why the substance reaches its melting point. Crystalline compounds have a constant melting point.

The transition from solid to liquid is so low. An example of a Melting point is solid oxygen has a melting point at -218.4 degrees celsius.

What is Freezing Point?

The Freezing point occurs when the substance undergoes changes and gets converted from liquid to solid. When the heat of the solid is taken away, the heat inside the solid keeps on decreasing, which results in the solid change into a liquid.

The substance freezes and melts at the same temperature. It is a physical process. It is a reversible process.

This change occurs in a high state energy state and then moves to lower state energy. The molecules have to move less due to a decrease in their temperature.

The impurity in the substance minimizes the freezing point. This is a good indication of purity. The purity in the substance can be defined using a freezing point.

Main Differences Between Melting and Freezing Point

  1. Melting point occurs when the substance undergoes a change in its state and turns solid to a liquid, but the Freezing point occurs when the substance undergoes changes and gets converted from liquid to solid.
  2. Atmospheric pressure is a major factor of melting point, but external pressure is a major factor of freezing point.
Difference Between Melting and Freezing Point

Conclusion

Melting point occurs when the substance undergoes a change in its state and turns solid to liquid.

Crystalline compounds use a melting point to define pure compounds and elements of the solid. When the heat of the solid is taken away, the heat inside the solid keeps on decreasing, which results from the solid change into a liquid.

The substance freezes and melts at the same temperature. It is a physical process. It is a reversible process.

During heating, the volume of the substance increases. The internal energy of the solid keeps on increasing when the solid gets heated.

The molecules move more when the temperature rises. Crystalline compounds have a constant melting point.

References

  1. https://www.sciencedirect.com/science/article/pii/S0095852248900488
  2. https://www.sciencedirect.com/science/article/pii/S0378775306015886

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