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Newton's Laws at the Atomic Level: Brownian motion.
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Newton's Laws at the Atomic Level:</strong> Brownian motion.</font>
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<td><img src="atomMainIdea.png" width="98" height="58"></td>
<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">You are often told that "molecules move randomly." How can that be true if <a href="script:page:0:message newtonsLaws.html">Newton's first law</a> is also true?</font></td>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif"><a href="script:page:0:message newtonsLaws.html">Newton's
first law</a> states that a moving object will continue to move in a
straight line, and a motionless object will remain at rest unless the
object is acted upon by some external force. To understand how a molecule
can apparently move "randomly" and at the same time only change direction
when a force is applied, we will go back to observations made in 1827 by
Robert Brown, a botanist.</font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">Brown observed
that pieces of pollen grains suspended in water moved in random
directions. Initially, people thought Brown had discovered the essence of
life. However, after several other experiments, it was apparent that <strong>any</strong>
tiny particles floating in water would move in this way, even microscopic
pieces of dust which had no connection to a living organism.</font>
<p>
<font size="4" face="Verdana, Arial, Helvetica, sans-serif"><strong>To
the right is a virtual microscope which is focused on a tiny particle
floating in water.</strong> <strong>Run the model <img width="7" height="12" src="play.gif">
to see the behavior that Brown observed and what is now known as
Brownian Motion.</strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>Describe the
motion of the particles you see above.</strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>Why does the
observed motion not seem to be following <a href="script:page:0:message newtonsLaws.html">Newton's
first law</a>.</strong></font>
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