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Brownian Motion
Brownian motion or pedesis (from Greek: πήδησις /pɛɖeːsɪs/
"leaping") is the random motion of particles suspended in
a fluid (a liquid or a gas) resulting from their collision
with the quick atoms or molecules in the gas or liquid.
The term "Brownian motion" can also refer to the
mathematical model used to describe such random movements,
which is often called a particle theory.This transport phenomenon is named after the botanist Robert Brown. In 1827, while looking through a microscope at particles found in pollen grains in water, he noted that the particles moved through the water but was not able to determine the mechanisms that caused this motion. Atoms and molecules had long been theorized as the constituents of matter, and many decades later, Albert Einstein published a paper in 1905 that explained in precise detail how the motion that Brown had observed was a result of the pollen being moved by individual water molecules. |
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