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 Jan 25 comment Why are four-legged chairs so common? What if you take into account the error in leg lenghts? In 4-legs, one of the legs can be shorter/longer than the others. Jan 25 comment Why are four-legged chairs so common? Moreover, 4-legs have the problem that when one leg is a bit shorter/larger, it will be unstable Apr 2 comment Could any object have zero mass? Can this invariant mass be negative? Jun 3 comment Why is the application of probability in QM fundamentally different from application of probability in other areas? In two words: Bell's inequality. May 23 comment Minimum connectivity required for mean field to be a good approximation? @Qmechanic Ok. You can edit it out if you like. May 23 comment Minimum connectivity required for mean field to be a good approximation? @YvanVelenik I am mainly interested in good approximate values of the free energy and the magnetization. I edited the question to add this. If you are willing to add some details, you should post your first comment as an answer. May 9 comment The “replica trick” initial formula? @AntonioRagagnin fixed. Mar 18 comment Double double-slit experiment As for the photon that you do measure, it loses the entanglement with the other photon after the measurement. And you lose the interference pattern after determining the slit through which it went. Mar 18 comment Double double-slit experiment I don't understand your argument. Why you say that the spatial superposition is built up during the evolution of the photons, and why this loses the entanglement? The fact that there's an uncertainty $\Delta x$ means that the second photon (the one you didn't measure) is in a superposition of states spreading through some spatial region on the order of $\Delta x$. If this spatial region is large enough as to include both slits, you have an interference pattern. Mar 18 comment Double double-slit experiment +1 Good point. But I think that in the first case there should be only one interference pattern, not both. After determining through which slit the measured photon went, I'll still be ignorant as to the slit used by the second photon. So in this case I destroy the interference pattern of the measured photon (because I know which slit it used), but I still see the other interference pattern (because $\Delta x$ doesn't let me determine the slit of the non-measured photon from the slit of the measured photon). Mar 13 comment Double double-slit experiment @CarlWitthoft "see recent experiments which seem to show that a particle's quantum state can be "found" in one slit while the particle is "seen" in the other." .... can you provide some references? Jan 15 comment Consequences of the new theorem in QM? What is GRW? Thanks. Dec 16 comment Does an electric field create a pH gradient? Let's also hope someone provides a more thorough physical analysis... :) Dec 9 comment Why the dissolution of hydrophobic compounds decreases the entropy of water molecules in the vicinity of the solute? @ManishEarth Can you migrate this question to Physics.SE now? It's been almost a week. The current answer by Nicolau is helpful but it doesn't explain the physical mechanism behind the entropy decrease. Dec 4 comment Why the dissolution of hydrophobic compounds decreases the entropy of water molecules in the vicinity of the solute? @ManishEarth agreed Dec 3 comment Why the dissolution of hydrophobic compounds decreases the entropy of water molecules in the vicinity of the solute? So you're saying that some very strongly polar hydrophiles can decrease the entropy of water molecules in their vicinity even more than hydrophobic compounds? That's more in accordance with my intuition... Dec 3 comment Why the dissolution of hydrophobic compounds decreases the entropy of water molecules in the vicinity of the solute? I want to understand the physical mechanism behind the entropy increase of dissolving a nonpolar compound in water. I think that's more suited to Physics.SE. Dec 2 comment Why the dissolution of hydrophobic compounds decreases the entropy of water molecules in the vicinity of the solute? @SatwikPasani I read it. Thanks for pointing it out, but it is not a duplicate. Actually, if you read the answer given there, it seems to support my intuition that hydrophilic compounds attach to water molecules, reducing their freedom and thus decreasing entropy. However, my question is why the decrease in entropy associated with the water molecules in the vicinity of an hydrophobic compound is greater. Nov 26 comment What is the “direction” of the transition dipole moment? (Understanding Eq. 9.29, Charge and Energy Transfer 3rd Ed, May & Kuhn) +1 Thanks! Very thorough answer. Oct 31 comment How long does it take for a chemostat to reach equilibrium? @ColinMcFaul It's a simple set of equations describing an aspect of the real world. I'm not interested in any rigorous mathematics. You can see the chemostat as a complex system, which can be seen as a topic inside physics. Many universities have a complex systems group inside their physics departments. Also, Szilard, one of the creators of the chemostat, was a physisist. That's why I don't think this question is off-topic here.