Laws of Thermodynamics
Category : 12th Class
The laws of thermodynamics describe the basic properties of energy. All interactions among pieces of matter are governed by the two laws of thermodynamics. The laws of thermodynamics deal with ?isolated systems? which are any parts of the universe that cannot exchange either matter or energy with any other parts.
First Law of Thermodynamics : The first law of thermodynamics states that energy can neither be created nor destroyed; but energy can change from one form to another.
In other words, within an isolated system the total quantity of energy remains constant. The first law is therefore often called the law of conservation of energy.
Second law of Thermodynamics : The second law of thermodynamics states that the amount of useful energy always decreases when energy is converted from one form to another.
In other words, every transfer or transformation of energy makes the universe disordered; no physical process or chemical reaction is 100 per cent efficient.
Entropy is a measure of the disorder or randomness within a system.
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