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.
Less water left behind means less water to freeze.**. **Problem: Even accounting for evaporation, hot water has been observed to freeze faster than cold. Theory: Hot water creates convection patterns in the air inside a freezer, which increases its cooling efficiency.***. ***Problem: You can run an experiment with hot and cold trays in the same freezer and still observe the warm one to freeze faster than the cool one.