Laws of thermodynamics
Like every other science, thermodynamics is also governed by certain laws.
There are basically four laws which are base of thermodynamics. These laws are
- Zeroth law of thermodynamics
- First law of thermodynamics
- Second law of thermodynamics
- Third law of thermodynamics
Now let us discuss each of them one by one.
Zeroth law of thermodynamics
Zeroth law of thermodynamics states that if two bodies are in thermal equilibrium with a third body then they must be in thermal equilibrium with each other.
Zeroth law of thermodynamics is the base of principle of temperature measurement of a body.
First law of thermodynamics
First law of thermodynamics is all about conservation of energy, it states that “Energy can neither be created nor be destroyed, it can only change its forms”.
Second law of thermodynamics
There are two statements associated with the second law of thermodynamics. They are
- Kelvin-Planck statement of the second law
- Clausius statement of the second law
Kelvin-Planck statement of the second law
No process is possible whose sole result is the absorption of heat from a reservoir and the conversion of this heat into work.
Clausius statement of the second law
No process is possible whose sole result is the transfer of heat from a cooler to a hotter body.
Third law of thermodynamics
The Third Law of Thermodynamics states that as the temperature of a system approaches absolute zero, its entropy approaches a constant (for pure perfect crystals, this constant is zero).
Second law definition: https://web.mit.edu/16.unified/www/FALL/thermodynamics/notes/node37.html
Third law of thermodynamics: https://www.allaboutscience.org/third-law-of-thermodynamics-faq.htm
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