If an object reaches the absolute zero of temperature (0 K = −273.15C = −459.67 °F), its atoms will stop moving. The third law of Thermodynamics is one of the laws from the three laws of thermodynamics. The third law of thermodynamics equation is mentioned below; S - S0 = kB lnΩ. This law states that the change in internal energy for a system is equal to the difference between the heat added to the system and the work done by the system: ΔU = Q − W Your email address will not be published. (4.1) Historically, Walter Nernst's formulation of the third law, called Nernst's Heat Theorem, in 1907 was somewhat weaker. The microstate in which the energy of the system is at its minimum is called the ground state of the system. Entropy, denoted by ‘S’, is a measure of the disorder/randomness in a closed system. The entropy determined relative to this point is the absolute entropy. This law was developed by the German chemist Walther Nernst between the years 1906 and 1912. 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All the atoms and molecules in the system are at their lowest energy points. The third thermodynamic law states that the entropy of a system approaches a constant value as it reaches absolute zero. Here, I’ll also tell you why entropy of pure crystalline substances is zero. The coefficient performance of a refrigerator is 5. The third law of thermodynamics establishes the zero for entropy as that of a perfect, pure crystalline solid at 0 K. With only one possible microstate, the entropy is zero. An important application of the third law of thermodynamics is that it helps in the calculation of the absolute entropy of a substance at any temperature ‘T’. It … Mathematical Explanation of the Third Law, Applications of the Third Law of Thermodynamics. ), What is Thermodynamics? If a substance is perfectly Crystalline, then its total number of microstates will be 1 (Ω = 1). 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