Entropy meaning

When a gas comes in contact with a solid surface, under suitable conditions of temperature and pressure, the concentration of the gas (the adsorbate) is always found to be greater near the surface (the adsorbent) than in the bulk of the gas phase. This process is known as adsorption. In all solids, the surface atoms are influenced by unbalanced attractive forces normal to the surface plane adsorption of gas molecules at the interface partially restores the balance of forces. Adsorption is spontaneous and is accompanied by a decrease in the free energy of the system. In the gas phase the adsorbate has three degrees of freedom in the adsorbed phase it has only two. This decrease in entropy means that the adsorption process is always exothermic. Adsorption may be either physical or chemical in nature. In the former, the process is dominated by molecular interaction forces, e.g., van der Waals and dispersion forces. The formation of the physically adsorbed layer is analogous to the condensation of a vapor into a liquid in fret, the heat of adsorption for this process is similar to that of liquefoction. 

S, a measure of disorder. Low entropy means little disorder high entropy means great disorder. It follows that we can express the pattern that we have identified as follows ... 

In thermodynamics, a measure of disorder is entropy, S. Low entropy means little disorder high entropy means great disorder. We need to express the concept of entropy quantitatively but even at this stage, with entropy being no more than another name for disorder we can see that the tendency of energy and matter to become more disordered can be expressed more formally as... 

The general thermodynamic properties of proteins reported above give rise to several questions What do the asymptotic (at Tx) values of the denaturation enthalpy and entropy mean and why are they apparently universal for very different proteins Why should the denaturation enthalpy and entropy depend so much on temperature and consequently have negative values at low temperature In other words, why is the denaturation increment of the protein heat capacity so large, with a value such that the specific enthalpies and entropies of various proteins converge to the same values at high temperature ... 

A negative sign for entropy means more order (or less chaos and less disorder). Raking up leaves is a more orderly state. 

The positive value for the change in entropy means that there will be more disorder. An expanding universe and a food fight are sure signs of more disorder. 

Shannon s entropy mean information content - information content shape descriptors... 

Shannon s entropy = mean information content information content... 

The paper by Szilard in 1929 (3) is a landmark for it showed how information influenced the process. But Szilard was not the first. In 1911, Van der Waals surmised a close connection between the Second Law and Bayes equation in statistical inference 04). (Today, we can demonstrate an essential connection between the two, but that is getting ahead of our story.) In 1930, G.N. Lewis wrote "Gain in Entropy means loss of information, nothing more"... 

The heat that is lost contributes to an increase in the entropy of the surroundings. A positive change in entropy means that the free energy for a catabolic process is more likely to be negative. Reactions with negative free-energy values are irreversible in that they require an input of energy to proceed in the opposite direction. 

High entropy means that values of the dimension are from a uniform distribution and the histogram for the dimension tends to be flat. While knowing a distribution is uniform is helpful to understand the dataset, it is sometimes more informative to know how far a distribution deviates from uniform distribution since a biased distribution sometimes reveals interesting outliers. 

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