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The Second Law of Thermodynamics states that the entropy of an isolated system can never increase , regardless of the nature of the processes involve...
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The Second Law of Thermodynamics states that the entropy of an isolated system can never increase , regardless of the nature of the processes involve...
The Second Law of Thermodynamics states that the entropy of an isolated system can never increase, regardless of the nature of the processes involved.
Entropy measures the degree of disorder or randomness within a system. In simpler terms, it tells us how "random" the microscopic particles of a system are.
According to the Second Law, a system can only reach a state of maximum entropy (or maximum disorder) when it reaches equilibrium. This means that no further work can be extracted from the system, and all available energy is converted into useful work.
An isolated system can reach equilibrium through various processes, such as:
Adiabatic processes where heat is transferred or work is done without any change in temperature.
Isothermal processes where the temperature remains constant.
Chilled processes where a system absorbs heat from its surroundings.
Examples:
Adiabatic expansion of an ideal gas: When an ideal gas is compressed adiabatically, its temperature and pressure increase due to the increase in the number of particles. This violates the Second Law, as the entropy of the gas increases during the process.
Isothermal expansion of a perfect crystal: When a perfect crystal is expanded isothermally, its entropy increases due to the increase in the number of disorder in its microscopic arrangement.
Heat absorption from a cold sink: When a system at a higher temperature is placed in contact with a sink at a lower temperature, heat is transferred from the sink to the system, resulting in an increase in the entropy of the system