Meaning of Entropy

What is Entropy:

What entropy is known the natural tendency to lose order in a system. The word, as such, comes from the Greek ἐντροπία (entropy), which literally means ‘turn’, although today it is used in various figurative senses.

The term entropy was initially coined by the German physicist Rudolf Clausius by observing that, in any irreversible process, a small amount of thermal energy always went outside the boundary of the system.

The term “entropy” is used in the most varied disciplines of knowledge, such as physics, chemistry, mathematics, astrophysics, linguistics, computing or ecology, to refer to the measure of disorder to which a system tends.

So, for example, in Physical, entropy refers to the degree of irreversibility that, in a thermodynamic system, is reached after a process that involves the transformation of energy. In Chemistry, refers to the entropy observed in the formation of a chemical compound. In Astrophysicsalludes to the entropy observed in black holes.

In information theories, entropy is the degree of uncertainty in relation to a set of data. Meanwhile in Computingrefers to randomness picked up by an operating system or application for use in cryptography.

Entropy in thermodynamics

What entropy It is known in the area of ​​thermodynamics physical magnitude that measures the part of the energy that cannot be used to do work and that, consequently, is lost.

Thus, in an isolated system, a small amount of energy will always be dissipated outside the system. This value, as such, always tends to grow in the course of a process that occurs naturally.

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Entropy describes the irreversibility of thermodynamic systems. For example, when an ice cube is placed in a glass of water at room temperature, after a few minutes, the cube will change to a liquid state, as its temperature will increase, while the water will cool down, until both reach thermal equilibrium. . This is because the universe tends to distribute energy uniformly, that is, to maximize entropy.

negative entropy

What negative entropyeither negentropyis called the entropy that a system exports to keep its entropy low.

To compensate for the degradation process to which every system is subject over time, some open systems manage to conserve their natural entropy thanks to the contributions of the other subsystems with which they are related.

In the open system, the negative entropy supposes a resistance that is sustained by the associated subsystems that allow it to rebalance the entropic system, unlike the closed system, in which the entropic process cannot stop by itself.

See also Enthalpy.