The combined weight of several liquids in an open flask can be less than the sum of the weights of the ingredients due to evaporation, as some of the liquid may vaporize and escape into the air. However, it can never exceed the total weight of the ingredients, as matter cannot be created or gained from the environment in this process.
In one or two sentences explain why the combined weight of several liquids mixed in an open flask can be less than but never more than the sum of all the weights of the ingredients
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