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Results tagged with entropy
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user 186136
An important extensive property of all systems in thermodynamics, statistical mechanics, and information theory, quantifying their disorder (randomness), i.e., our lack of information about them. It characterizes the degree to which the energy of the system is *not* available to do useful work.
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is entropy the same up to a constant?
I have understood that what's important about entropy is its change $\Delta S$, not $S$ itself, much like the electrostatic potential. … Therefore, can I assume that a constant entropy can be redefined to be zero?
In particular, I have, for high temperatures, $S=2+\Sigma n_{i}ln(n_{i})$, Can I say that $S=\Sigma n_{i}ln(n_{i})$ ? …
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three particles on a state with negative energy have negative temperature?
Suppose three particles on a state with energy $-\epsilon$, that is, $H\lvert\Phi_1\rangle=-\epsilon\lvert\Phi_1\rangle$, as the average energy per particle is $kT$, but is also $-\epsilon/3$, wouldn' …
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Heat transfer reservoir and system at same temperature
I just read that "a heat transfer between a reservoir and a system at same temperature is a reversible process". If there's no temperature difference, why would there be a heat flow?
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Infinite entropy in ideal gas
Does it make sense that entropy goes to infinity as temperature goes to infinity? … I was used to finding asymptotic behaviours for entropy as a function of temperature, so this result is confusing me …