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www.britannica.com/science/entropy-physics

Entropy, the measure of a system’s thermal energy per unit temperature that is unavailable for doing useful work.Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. The concept of entropy provides deep insight into the direction of spontaneous change for many everyday phenomena.

en.wikipedia.org/wiki/Entropy

There are many ways of demonstrating the equivalence of "information entropy" and "physics entropy", that is, the equivalence of "Shannon entropy" and "Boltzmann entropy". Nevertheless, some authors argue for dropping the word entropy for the H function of information theory and using Shannon's other term "uncertainty" instead.

physics.stackexchange.com/questions/470202/ambiguity-in...

Entropy is a property of a macrostate, not a system. So $\Omega$ is the number of microstates that correspond to the macrostate in question.. Putting aside quantization, it might appear that there are an infinite number of microstates, and thus the entropy is infinite, but for any level of resolution, the number is finite.

www.khanacademy.org/science/physics/thermodynamics/laws-of...

Clarifying that the thermodynamic definition of Entropy requires a reversible system. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

hyperphysics.phy-astr.gsu.edu/hbase/Therm/entrop.html

Entropy is a crucial microscopic concept for describing the thermodynamics of systems of molecules, and the assignment of entropy to macroscopic objects like bricks is of no apparent practical value except as an introductory visualization. Index Entropy concepts

www.felderbooks.com/papers/entropy.html

Entropy is a well-defined quantity in physics, however, and the definition is fairly simple. The statement that entropy always increases can be derived from simple arguments, but it has dramatic consequences. In particular this statement explains many processes that we see occurring in the world irreversibly.

study.com/.../what-is-entropy-definition-law-formula.html

In this lesson, you will learn the definition of entropy and discover how it can be applied to everyday situations. You will explore the second law of thermodynamics which is where entropy is ...

physics.stackexchange.com/questions/205416/entropy-definitions

So I have learned that entropy is the measure of disorder of a system. For the IPhO this was of course not enough as we need to be able to calculate entropy changes of ideal gases. Those equations were derived from another definition of entropy, the integral definition dS = dE / T. This relates temperature with entropy.

www.merriam-webster.com/dictionary/entropy

Entropy definition is - a measure of the unavailable energy in a closed thermodynamic system that is also usually considered to be a measure of the system's disorder, that is a property of the system's state, and that varies directly with any reversible change in heat in the system and inversely with the temperature of the system; broadly : the degree of disorder or uncertainty in a system...

www.physics.ohio-state.edu/p670/textbook/Chap_6.pdf

Section 6.2: To discuss equilibrium, entropy and the second law of thermodynamics Section 6.3: To examine irreversible processes and perpetual motion In Chapter 6 we will discuss one of the most intriguing concepts in physics – entropy. Entropy is related to the order and disorder of a system. It is sometimes