What is the atmosphere?
The “blanket” of air that surrounds the Earth is called Earth’s atmosphere.
Where in the atmosphere is greatest concentration of air?
The layer of air next to Earth’s surface is where Earth’s weather, including clouds occurs.This bottom layer of the atmosphere has the greatest density of air. Density is a measure of the concentration of a substance in a specific volume. For example:
Box A in the diagram has a greater concentration of blue dots than does box B. Since the boxes are of equal size, they have the same volume. This means that box A has a greater density (concentration of blue dots) than does box B. For an accurate density comparison, you need equal volumes.
How does altitude affect the density of air in Earth’s Atmosphere.