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Covers the study of (mostly homogeneous) macroscopic systems from a heat/energy/entropy point of view. Consider also using tag: [statistical-mechanics].

5
votes
$\delta W=\mathrm{d}(PV)$ is wrong. We always have $\delta W=P\mathrm{d}V$ (unless there are other interactions like magnetic field). In fact, the reason that many books opt to denote infinitesimal wo …
answered Jan 24 '13 by Siyuan Ren
0
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To boil, water needs not only reach the boiling point, but also continually absorb heat (latent heat). The water in the sac won't boil because it can't get anymore heat from its surroundings due to be …
answered Mar 4 '12 by Siyuan Ren
2
votes
Relative humidity equals actual water vapor pressure divided by saturated water vapor pressure. As temperature goes up, saturated vapor pressure goes up as well, and relative humidity will go down, if …
answered Oct 6 '11 by Siyuan Ren
4
votes
The most fundamental definition of temperature is derived from the zeroth law of thermodynamics. The zeroth law declares thermal equilibrium an equivalence relationship, and thus we can tag each …
answered Jan 19 '12 by Siyuan Ren
1
vote
The fact that $k_B \ln \Omega$ coincides with entropy $S$ defined in thermodynamics comes from microcanonical ensemble. There are many resources out there on microcanonical ensemble, for example … thermodynamic temperature, and thermodynamic temperature alone, by virtue of zeroth law of thermodynamics. So $\beta=f(T)$. Compare this to $$\frac{1}{T}=\left( \frac{ \partial S }{ \partial U …
answered Feb 1 '12 by Siyuan Ren