in one or to sentences, explain why the combined weight of several liquids mixed in a open flask can be less then but never more then the sum of all the weights of the ingredients.
The combined weight of several liquids mixed in an open flask can be less than the sum of all the weights of the ingredients due to the possibility of evaporation or displacement of some of the liquids, but it can never be more because no additional weight is introduced during the mixing process.
