Achemist prepares a solution of sodium chloride by measuring out of sodium chloride into a volumetric flask and filling the flask to the mark with water. calculate the concentration in of the chemist's sodium chloride solution. round your answer to significant digits.

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answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.