You are conducting an experiment with two very reactive substances. one will react with oxygen (o) and other substances in the air, and the other will react to metal in a container. what type of environment can you seal them in so they only react with each other?

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.