While camping up at hal mountain (5,500 feet above sea level), it generally takes sandy about the same amount of time to boil water for her soup as it takes to make a sandwich. this week, sandy is camping at a trail that is only about 200 feet above sea level. sandy is very hungry and wants something to eat immediately. should she make the soup or sandwich? which would be ready more quickly and why?

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.