How does vinegar know how to fizz when you add baking soda?
It doesn’t “know” in any real sense. It’s just chemistry. Molecules bump together and it takes less energy to stick together or change shape than it would to stay separate.
Picture two drops of water on a sheet of glass. They get close, then all of a sudden they join. They look so happy together! They look as if they “wanted” to join. But it’s just molecules behaving as molecules do.
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