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 May 19 awarded Yearling Oct 21 awarded Student May 9 comment Density of classical states in quantum theory @genneth: DFT is exact only theoretically. noone has ever found correct functional. it is like telling that using configurational integral is exact solution, but it is just rephrasing the problem. Apr 24 comment Density of classical states in quantum theory DFT is an approximation often called an expensive RNG. I talk about some precise stuff, exact wavefunction. Not those coupled cluster or PIMC approximations. Apr 24 awarded Editor Apr 24 revised Density of classical states in quantum theory the word "root" after "square" was added by an invisible evil dwarf Apr 16 asked Density of classical states in quantum theory Apr 16 awarded Nice Answer Apr 15 answered What does it mean for two objects to “touch”? Apr 11 answered How does an object regains its neutrality after being charged by rubbing? Apr 11 awarded Supporter Apr 10 answered Boundary layer theory in fluids learning resources Apr 10 comment How to find that a molecule has zero spin? Pauli exclusion priciple implies only that only 2 electrons can occupy 1 orbital. Energetic degeneracy of more distinct orbitals can cause some orbitals to be only singly occupied. There is also a Hund principle of maximum multiplicity (electrons having same spin repel less each other resulting in lower energy). So not all atoms/ions/compounds with even number of electrons have zero spin. Apr 10 awarded Teacher Apr 10 answered How to find that a molecule has zero spin? Apr 10 comment What formulae for calculating fluid pressure change involves these parameters? It seems to be volumetric flow. I do not see viscosity in the formula. Apr 10 answered What is the molecular model of heat of mixing? Apr 10 answered Energy formula for separating $O_2$ from mixture of $O_2$, $NH_3$ and $H_2O$