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.
The volume of water changes when the water changes state from a liquid to a solid because of the formation of hydrogen bonds within it. The bonds, which are weak, are always p â¦ resent to some degree in the liquid, but as water goes solid, the formation of hydrogen bonds sets up a molecular arrangement in the water. The bonds force the water molecules into a solid structure and they push the molecules apart to do that. The extra space the water molecules then take up makes the ice less dense than the water from which it formed. That is why ice is less dense than water, and why it floats on water as we see it does. Why does the volume of water change when it freezes? That is because the gas particle's are traped in the ice