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An irreversible process increases the total entropy of the system and its surroundings. The second law of thermodynamics can be used to determine whether a hypothetical process is reversible or not. Intuitively, a process is reversible if there is no dissipation. For example, Joule expansion is irreversible because initially the system is not ...
In physics, Loschmidt's paradox (named for J.J. Loschmidt), also known as the reversibility paradox, irreversibility paradox, or Umkehreinwand (from German 'reversal objection'), [1] is the objection that it should not be possible to deduce an irreversible process from time-symmetric dynamics.
The statement is often misinterpreted as claiming that evolution is not reversible, [3] or that lost structures and organs cannot reappear in the same form by any process of devolution. [ 4 ] [ 5 ] According to Richard Dawkins , the law is "really just a statement about the statistical improbability of following exactly the same evolutionary ...
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Major process theories are expectancy theory, equity theory, goal-setting theory, self-determination theory, and reinforcement theory. [123] Another way to classify theories of motivation focuses on the role of inborn physiological processes in contrast to cognitive processes and distinguishes between biological, psychological, and ...
The subscript 'i' in ˙ refers to the fact that the entropy is produced due to irreversible processes. The entropy-production rate of every process in nature is always positive or zero. This is an essential aspect of the second law.
For this model, the duct area remains constant, the flow is assumed to be steady and one-dimensional, and no mass is added within the duct. The Fanno flow model is considered an irreversible process due to viscous effects. The viscous friction causes the flow properties to change along the duct.
Reversal theory is a structural, phenomenological theory of personality, motivation, and emotion in the field of psychology. [1] It focuses on the dynamic qualities of normal human experience to describe how a person regularly reverses between psychological states, reflecting their motivational style, the meaning they attach to a situation at a given time, and the emotions they experience.