Air is a mixture because it is odorless at low temperatures. Why is this statement
wrong?

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.

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

answerlinnaeus;