The first law of thermodynamics is called the law of conservation of energy. The second law of thermodynamics states that entropy increases. The Nernst statement of the third law of thermodynamics implies that it is not possible for a process to bring the entropy of a given system to zero in a finite number of operations. Alternate Statements of the 3 rd Law of Thermodynamics. We can make careful calorimetric measurements to determine the temperature dependence of a substance’s entropy and to derive absolute entropy values under specific conditions. The third law of thermodynamics says that "If an object reaches the absolute zero temperature (0 K or −273.15 °C or −459.67 °F), its atoms will stop moving" ; The definition is: at absolute zero , the entropy of a perfectly crystalline substance is zero.. Experimentally, it is not possible to obtain −273.15°C, as of now. The third law of thermodynamics says that the entropy of a perfect crystal at absolute zero is exactly equal to zero. This limiting condition for a system’s entropy represents the third law of thermodynamics: the entropy of a pure, perfect crystalline substance at 0 K is zero. Our human body is a very good example to explain almost all concepts of thermodynamics, coz thermodynamics itself is just the written form of how nature works. It says that the energy in the universe remains constant. In other words, you can’t get down to absolute zero at all. The third law of thermodynamics is essentially a statement about the ability to create an absolute temperature scale, for which absolute zero is the point at which the internal energy of a solid is precisely 0. The third law of thermodynamics has two important consequences: it defines the sign of the entropy of any substance at temperatures above absolute zero as positive, and it provides a fixed reference point that allows us to measure the absolute entropy of any substance at any temperature. The Third Law of Thermodynamics . Thanks for A2A. Some of important applications are: 1) This law provides the bases for 1st and 2nd law i.e we can calculate absolute entropies and chemical affinity of substance(for chemists). The second law of thermodynamics says that heat cannot transfer from a colder to a hotter body as its sole result and the entropy of the universe does not decrease. The third law of thermodynamics says: . The fact that we cannot build a perpetual motion machine, is one example. The third law of thermodynamics is pretty straightforward — it just says that you can’t reach absolute zero (0 kelvin, or about –273.15 degrees Celsius) through any process that uses a finite number of steps. If an object reaches the absolute zero of temperature (0 K = −273.15C = −459.67 °F), its atoms will stop moving. This law was developed by the German chemist Walther Nernst between the years 1906 and 1912.