A little Round rainbow on the road after a rain comes from light reflecting through a layer of oil. Everyone knows that oil and water don't mix. So obviously the immiscibility of the two liquids is due to a loss of entropy in the system. But there are a lot of science books that incorrectly state that the mixing process is endothermic when in fact it is exothermic, with the formation of solvent cages and the endergonicity of solvation due to entropy, not enthalpy! Well, duh!

10.01.19