What is the isolated system?

in physical science, an isolated system is either of the following:

1. a physical system so far removed from other systems that it does not interact with them.

2. a thermodynamic system enclosed by rigid immovable walls through which neither mass nor energy can pass.

Explanation:

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.