Entropy

Entropy (astrophysics)

In astrophysics, what is referred to as "entropy" is actually the adiabatic constant derived as follows. Using the first law of thermodynamics for a quasi-static, infinitesimal process for a hydrostatic system For an ideal gas in this special case, the internal energy, U, is only a function of the temperature T; therefore the partial derivative of heat capacity with respect to T is identically the same as the full derivative, yielding through some manipulation Further manipulation using the differential version of the ideal gas law, the previous equation, and assuming constant pressure, one finds For an adiabatic process and recalling , one finds One can solve this simple differential equation to find This equation is known as an expression for the adiabatic constant, K, also called the adiabat. From the ideal gas equation one also knows where is Boltzmann's constant.Substituting this into the above equation along with and for an ideal monatomic gas one finds where is the mean molecular weight of the gas or plasma; and is the mass of the Hydrogen atom, which is extremely close to the mass of the proton, , the quantity more often used in astrophysical theory of galaxy clusters.This is what astrophysicists refer to as "entropy" and has units of [keV cm2]. This quantity relates to the thermodynamic entropy as (Wikipedia).

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Teach Astronomy - Entropy of the Universe

http://www.teachastronomy.com/ The entropy of the universe is a measure of its disorder or chaos. If the laws of thermodynamics apply to the universe as a whole as they do to individual objects or systems within the universe, then the fate of the universe must be to increase in entropy.

From playlist 23. The Big Bang, Inflation, and General Cosmology 2

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Entropy is NOT About Disorder

Entropy is often taught as a measure of how disordered or how mixed up a system is, but this definition never really sat right with me. How is "disorder" defined and why is one way of arranging things any more disordered than another? It wasn't until much later in my physics career that I

From playlist Thermal Physics/Statistical Physics

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Physics - Thermodynamics 2: Ch 32.7 Thermo Potential (10 of 25) What is Entropy?

Visit http://ilectureonline.com for more math and science lectures! In this video explain and give examples of what is entropy. 1) entropy is a measure of the amount of disorder (randomness) of a system. 2) entropy is a measure of thermodynamic equilibrium. Low entropy implies heat flow t

From playlist PHYSICS 32.7 THERMODYNAMIC POTENTIALS

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What Is "Entropy?"

Entropy Explained In 60 Seconds!! #Thermodynamics #Chemistry #Physics #Math #NicholasGKK #Shorts

From playlist Heat and Chemistry

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Astronomy: The Big Bang (29 of 30) The Big Bang and Entropy

Visit http://ilectureonline.com for more math and science lectures! In this video I will explain the Big Bang and entropy of how the universe achieve thermal equilibrium.

From playlist ASTRONOMY 25 THE BIG BANG

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Physics - Thermodynamics: (1 of 5) Entropy - Basic Definition

Visit http://ilectureonline.com for more math and science lectures! In this video I will explain and help you understand entropy.

From playlist PHYSICS - THERMODYNAMICS

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Is ENTROPY Really a "Measure of Disorder"? Physics of Entropy EXPLAINED and MADE EASY

This is how I personally wrapped my head around the idea of entropy! I found the statistical mechanics explanation much easier to grasp than the thermodynamics (original) one. Hey everyone, I'm back with another video, and this one has been highly requested! I really enjoy making videos a

From playlist Thermodynamics by Parth G

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A better description of entropy

I use this stirling engine to explain entropy. Entropy is normally described as a measure of disorder but I don't think that's helpful. Here's a better description. Visit my blog here: http://stevemould.com Follow me on twitter here: http://twitter.com/moulds Buy nerdy maths things here:

From playlist Best of

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Entropy: The Heat Death of The Universe

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From playlist Science & Technology 🚀

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Buoyancy effects in dilute astrophysical plasmas by Prateek Sharma

Summer school and Discussion Meeting on Buoyancy-driven flows DATE: 12 June 2017 to 20 June 2017 VENUE: Ramanujan Lecture Hall, ICTS, Bengaluru Buoyancy plays a major role in the dynamics of atmosphere and interiors of planets and stars, as well as in engineering applications. This field

From playlist Summer school and Discussion Meeting on Buoyancy-driven flows

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Statistical Mechanics of Gravitational N-Body Systems - S. Tremaine - 2/24/2015

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From playlist Walter Burke Institute for Theoretical Physics - Dedication and Inaugural Symposium - Feb. 23-24, 2015

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How ‘heat death’ will destroy the universe | Katie Mack | Big Think

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From playlist The universe explained | Big Think

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Learning Multiscale Physics with Deep Neural Networks - Mallat - Workshop 2 - CEB T3 2018

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Galaxy Clusters (Lecture 2) by Stefano Borgani

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From playlist Cosmology - The Next Decade

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Black Holes - II (Lecture - 05) by G Srinivasan

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Darkness Visible: Shedding New Light on Black Holes

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Christian Ott: Modeling the Death of Massive Stars

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From playlist Numerical Relativity

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Teach Astronomy - Entropy

http://www.teachastronomy.com/ Entropy is a measure of disorder. The theory of thermodynamics states that entropy will tend to increase in any physical system. It also shows that heat is the most disordered form of energy because it represents the random motion of atoms and molecules, so

From playlist 15. Stars 2

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Jonathan Gair - Rapid and robust parameter estimation for gravitational wave observations

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Related pages

Molecular weight | Proton | Temperature | Hydrogen atom | Adiabatic process | Entropy