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Brownian Motion

Brownian Motion

Brownian Motion 
	In 1827, the English botanist Robert Brown noticed that pollen
grains suspended in water jiggled about under the lens of the
microscope, following a zigzag path such as the picture on page
three.  Brown had discovered what is now known as Browian motion
or Browian movement.  Even more remarkable was the fact that
pollen grains that had been stored for a century moved in the same
way.  The motion appeared to be totally random and at first Brown
thought that he had discovered the “primitive molecule”.  That is
until he observed the same motion in dusty particles of inorganic
matter.  Many people tried to master the concept of Brownian
movement and had to go through some testy times.  In 1889, G.L.
Gouy found that the "Brownian" movement was more rapid for
smaller particles.  For example, we do not observe Brownian motion
in cars, buildings, or people.  In 1900, F.M. Exner undertook the
first quantitative studies, measuring how the motion depended on
temperature and particle size.  And he found that the speed of
movement increased with a rise in temperature, but then, it
decreased if bigger particles were used in the observation. 
	The first truly reasonable explanation of Brownian movement
came in 1877 by a man with the

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