The particles of a gas move in continuous random motion and repeatedly strike the container walls. Averaged over the whole surface and over time, this bomba...
Question 1 Report
The particles of a gas move in continuous random motion and repeatedly strike the container walls. 
Averaged over the whole surface and over time, this bombardment is measured as the gas
Answer Details
As the diagram shows, gas particles are in continuous random motion, moving in all directions and repeatedly striking the container walls. Each collision between a particle and a wall exerts a tiny force on the wall. When this bombardment is averaged over the entire wall surface and over time, the cumulative effect of all these collisions produces a steady force per unit area.
Force per unit area is the definition of pressure. The gas pressure is therefore the macroscopic result of the microscopic collisions of vast numbers of particles with the container walls.
Weight and mass are properties of the gas as a whole, not the result of wall bombardment. Volume describes the space the gas occupies, not the effect of collisions. Pressure is the only quantity that directly corresponds to the average force exerted per unit area by the particle bombardment.
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