When you mix liquids in an open flask, some of the liquid can evaporate into the air, which makes the total weight lighter than if you had all the liquids in their separate containers. However, you can't have more weight than the total because you're just combining the same amounts of liquid.
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
4th grade
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