Three liquids are given to you one is hydrochloric acid, another is sodium hydroxide and third is a sugar solution .how will you identify them? you have only turmeric indicator

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.