How did the first peoples know which foods were safe to eat? Excellent question! Food historians make educated guesses based on ancient records and modern practices.
When water freezes its entropy decreases. This does not violate the second law of thermodynamics. The second law does not say that entropy can never decrease anywhere. It just says that the total entropy of the universe can never decrease.he entropy increases whenever heat flows from a hot object to a cold object. It increases when ice melts, water is heated, water boils, water evaporates. The entropy increases when a gas flows from a container under high pressure into a region of lower pressure.
1 The entropy of the salt solution is greater than the entropy of pure water; the Na + and Cl-ions are spread out in the solution. 2  When salt water freezes, the S is more negative, due to the fact that the salt water is more disordered, and so it becomes more ordered when the water frezzes. The total entropy is equal to: 2  Using this equation for the freezing of water at -10 o C for example: 3  The overall entropy increases, and so the reaction is feasible (in thermodynamic terms, the reaction would be described as being spontaneous; however, this does not in any way describe how fast the reaction occurs).