Introduction to entropy definition:
The concept of entropy is that nature tends from order to disorder in a finite system. This depicts that the right hand box of molecules happened before the left. Newton’s law to depict the motion of molecules would not tell you which came first
Entropy is a thermodynamic property that is the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work. Perhaps the most familiar manifestation of entropy is that, following the laws of thermodynamics, entropy of a closed system always increases and in heat transfer situations, heat energy is transferred from higher temperature components to lower temperature components.
In thermally isolated systems, entropy runs in one direction only (it is not a reversible process). One can measure the entropy of a system to determine the energy not available for work in a thermodynamic process, such as energy conversion, engines, or machines.
Such processes and devices can only be driven by convertible energy, and have a theoretical maximum efficiency when converting energy to work. During this work, entropy accumulates in the system, which then dissipates in the form of waste heat.
Entropy and energy (which are actually components of second law and first law of thermodynamics respectively) and their relationship are important to an understanding not just of physics, but to life. Earlier, the second law of thermodynamics was considered as ‘law of disorder’. The main development is the recognition of the “law of maximum entropy production” or “MEP”.
Explanation of Entropy:
If one considers that nature takes things from order to disorder, then it will get almost universal recognition and acceptance. It occurs day in and day out. Spend hours cleaning your desk, your basement, and it seems to spontaneously revert back to disorder and chaos before your eyes. So, we can say that entropy is a measure of disorder, and that nature tends toward maximum entropy for any isolated system and this idea allows us to have a little insight into second law of thermodynamics.
Explanation of Disorder:
Defining “disorder” to understand “entropy” should be done carefully. A more better way to characterize entropy is to say that it is a measure of the “multiplicity” associated with the state of the objects. When we throw a dice, the probability of getting a seven is more than that of getting a two. This is because a seven can be obtained in six different ways while a two can be obtained in one way only. So seven has higher multiplicity than two, and we can conclude that a seven represents higher “disorder” or higher entropy.
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