Platinum has a density of 21 g/cm^ 3 . A platinum ring is placed in a graduated cylinder that contains water. The water level rises from 4.0 mL to 4.2 when the ring is added. What is the mass of the ring? A. 4.2g B. 5.2 g C. 3.8 g D. 2.6

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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.