What is the Third Law of Thermodynamics?

Third law of thermodynamics states that
“As temperature approaches absolute zero, the entropy of a system approaches a constant minimum”
Pretty confusing right? Now let me make it simple for you.

But first, let’s recall what entropy is?
Entropy is the measure of disorder and randomness of a system.
For better illustration, take for an example is the bottle of carbonated drink. When you shake it, you can see bubbles forming at the top surface and when you open it, the bottle of coke explodes and forms a lot of bubbles. This is entropy. The bottle of coke at rest has a very low entropy but the moment you shake it, you have introduced kinetic energy in the molecules inside the bottle, increasing the disorder and randomness of the molecules. Thus, its entropy increased which we physically observed through its bubble formation & the explosion after you opened it.

The 3rd law states that when a pure crystal is cooled approaching absolute zero, it becomes highly organized/ entropy approaches zero.
This means that any substance with a temperature greater than absolute zero must have a positive amount of entropy.
Also, it indicates that material or substance requires a certain amount of energy to raise their temperature.

Enjoy this video about the Third Law of Thermodynamics.



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