Air is made up of gas particles. these particles exert pressure on every object they collide against. this pressure is known as air pressure. which of the following statements about air pressure is true? a. air pressure increases as altitude increases. b. warm air tends to have a higher air pressure than cold air. c. the atmosphere's air pressure does not vary. d. air pressure decreases as altitude increases.

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

The items in the following list are all units of matter. which is the smallest unit that retains the properties of the matter? a.) atom b.) compound c.) electron d.) element

How do you count the total number of atoms present on one side of a chemical equation?