Air Pressure. Newton’s Laws of Motion. An object’s velocity remains constant unless acted upon by an external force. An object’s acceleration (change in velocity) is directly proportional to the force and inversely proportional to its mass.
Wall has area A
Fewer molecules hitting wall give lower pressure
More molecules hitting wall give higher pressure
Main influence is density of air:
Number has greater affect on density
Gravity compresses atmosphere giving maximum number density (pressure) at surface.