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Daniel Bernoulli was born into a family of mathemeticians on February 8 1700 He was the only person in his family to make an impressive mark on physics Bernoulli became a Swiss physicist and mathmatician who made enourmous contributions to the world of physics He uncovered many significant phenomena in hydrodynamics and in 1738 published his most famous work Hydrodynamica which was a study of equilibrium pressure and velocity of fluids He proved that as the velocity of fluid flow increases its pressure decreases Bernoullis principle was an early formulation of the subsequent idea of the conservation of energy Bernoullis Hydrodynamica was also the first attemt to explainof the behavior of gasses with changing pressure and temperature This was the beginning of the kinetic theory of gasses His gas model has been revived and transformed into a powerful theory regarding the thermal and mechanical properties of gases using the atomic hypothesis Bernoulli thought of the corpuscles of the gas as so minute that there were practically an infinite number under ordinary conditions even in a small container In their rapid motion these corpuscles collide with each other and also with the rigid walls of the closed vessel The collisions however can be assumed to be perfectly elastic therefore the kinetic energy of the particles is conserved and the motion can continue undiminished Therefore the pressure which the gas is expected to exert against all sides of the container is caused by the incessant impact of millions of high speed particles hence the name impact theory of gas pressure Imagine a gas filled cylindrical container with the top end that is able to slide up and down in and out like a piston If the volume is slowly decreased the corpuscles are more crowded in the progressively smaller space and the number of collisions per second with the walls would be larger ie the pressure should become greater as observed Bernoulli even calculated
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