Which statement accurately describes the relationship between air pressure, air density, or altitude? A. As altitude increases, pressure increases.

B. As altitude increases, air density increases.

C. Air pressure and density are lowest at sea level.

D. Denser air exerts more pressure than less dense air.

A

Explanation:

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

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.