You have been given 42 g of a mystery solid. When placed in 100 g of water and heated to approximately 29 °C, it appears to create a saturated solution. State your conclusions about the identity of the substance.

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.