If 500.0 mL of hydrogen gas at 20.0 C and 800.0mmHg is changed to STP, what will its new volume be?

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.

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it's c (engineer's do their work with mechanical stuff not on any living being)