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Introduction
Thermodynamics focuses on the transferring of energy and its relation to heat and work. The Laws of Thermodynamics govern this branch of science.
Zeroth Law of Thermodynamics
If the temperature of two objects are the same as the third object, the first two objects have the same temperature.
It sets the basis for measuring temperature.
Also, if you were wondering why it is called the "zeroth" law, it was established later than the three existing laws but placed first because it establishes the foundation for all other thermodynamic laws.
First Law of Thermodynamics
Energy cannot be created nor destroyed; it can only be transformed.
The law also implies that the total amount of energy in the universe is constant.
Such forms include:
Potential Energy (e.g. chemical, electrical, nuclear)
Kinetic Energy (e.g. mechanical, sound, radiant)
Second Law of Thermodynamics
The entropy of the universe spontaneously increases over time.
Energy tends to distribute itself and spread out, as that would increase the entropy of areas with less energy.
This process would stop when energy becomes equally distributed throughout the universe.
Third Law of Thermodynamics
The colder a system gets, less motion and entropy exists is present.
If the temperature approaches 0 K, all motion nearly stops and entropy reaches a minimum.
Note that it is impossible to actually reach 0 K, as it gets progressively harder—and eventually impossible—to remove energy from a system.
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