![Bernoulli model of gas pressure[Credits : Encyclopædia Britannica, Inc.; based on Daniel Bernoulli, Hydrodynamica (1738)]](http://media-2.web.britannica.com/eb-media/49/54449-004-1E68052A.jpg)
As conceived by Daniel Bernoulli in Hydrodynamica (1738), gases consist of numerous particles in rapid, random motion. He assumed that the pressure of a gas is produced by the direct impact of the particles on the walls of the container.
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