{"id":17229,"date":"2018-03-11T19:07:29","date_gmt":"2018-03-11T19:07:29","guid":{"rendered":"http:\/\/sitepourvtc.com\/?page_id=17229"},"modified":"2022-11-10T12:13:55","modified_gmt":"2022-11-10T12:13:55","slug":"third-law-of-thermodynamics-3rd-law","status":"publish","type":"page","link":"https:\/\/sitepourvtc.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/third-law-of-thermodynamics-3rd-law\/","title":{"rendered":"Third Law of Thermodynamics – 3rd Law"},"content":{"rendered":"
According to the third law of thermodynamics:<\/strong><\/p>\n The entropy of a system approaches a constant value as the temperature approaches absolute zero.<\/em><\/p>\n Based on empirical evidence, this law states that the entropy of a pure crystalline substance is zero<\/strong> at the absolute zero of temperature<\/strong>, 0 K and that it is impossible using any process, no matter how idealized, to reduce the temperature of a system to absolute zero in a finite number of steps. This allows us to define a zero point for the thermal energy of a body.<\/p>\n<\/div><\/div>\n The German chemist Walther Nernst<\/strong> developed the third law of thermodynamics during the years 1906\u201312. For this research, Walther Nernst won the 1920 Nobel Prize in chemistry. Therefore the third law of thermodynamics is often referred to as Nernst\u2019s theorem<\/strong> or Nernst\u2019s postulate<\/strong>. As can be seen, the third law of thermodynamics states that the entropy of a system in thermodynamic equilibrium approaches zero<\/strong> as the temperature approaches zero.<\/strong> Or conversely, the absolute temperature <\/strong>of any pure crystalline substance<\/strong> in thermodynamic equilibrium approaches zero<\/strong> when the entropy approaches zero.<\/strong><\/p>\n Nernst Heat Theorem<\/strong> (a consequence of the Third Law) is:<\/p>\n