pressure {Ans: Force per unit area.}Volume {Ans: The amount of space an object takes up}barometer {Ans: An instrument that measures atmospheric pressure}Gas {Ans: A state of matter with no definite shape or volume}atmospheric pressure {Ans: Force exerted by the weight of the air}vary inversely {Ans: A term used to describe the relationship between two variables whose graph forms a curve that slopes downward.}