Thermodynamics is the study of the relations between heat, work, temperature, and energy. The laws of thermodynamics describe how the energy in a system changes and whether the system can perform useful work on its surroundings. Traditionally, thermodynamics has recognised three fundamental laws, simply named by an ordinal identification, the first law, the second law, and the third law. A more fundamental statement was later labelled as the zeroth law, after the first three laws had been established. The first law of thermodynamics states that energy can neither be created nor destroyed, only altered in form. The second law of thermodynamics states that the total entropy of an isolated system (the thermal energy per unit temperature that is unavailable for doing useful work) can never decrease. The third law of thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches absolute zero.

Ridhi Kumari

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