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Seeing atomic motion in gases
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Seeing atomic motion in gases</strong></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">Gas is one of the states of matter. Atoms and molecules in a gas move randomly and freely. With the model on this page, you can observe this. You can also choose to "travel" with an atom to see how chaotic the motion can be.
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<img width="33" height="23" src="atomsBullet.png">
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<strong><font size="5" face="Verdana, Arial, Helvetica, sans-serif" color="#5d6b86">A
helium gas in a box</font></strong>
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<img width="18" src="rule.png" height="6">
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1. Click the "How to use simulation controls" button to learn how to run a
simulation.
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<input name="submit" script="script:page:0:message controllerPanel.html" type="submit" value="How to use simulation controls">
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<br>
2. Run the model and observe how atoms in a helium gas move (<a href="script:page:0:message <t><font face=Verdana>To view the 3D model, click on the box and drag the mouse to rotate <br>and use SHIFT+drag to zoom in and out.</font></t>">Tip</a>).
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3. Imagine you are small enough to "sit" on an atom, what would you see?
what would you feel? Click the button below to find out.
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<input name="submit" type="submit" script="script:mw3d:1:set navigation on;camera %number_of_atoms*rand();" value="If I could sit on an atom">
<input name="submit" type="submit" script="script:mw3d:1:reset;run;" value="Reset View">
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4. Click the "Reset View" button. Select the "Box-resizing mode" below
the model. Follow the instructions for reshaping the box.
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<b>To reshape the box:</b> Click reset (if you haven't already) and select
the "Box-resizing mode" check box, move the mouse to a face of the box and
then drag the mouse to change the size.
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<strong><font face="Arial, Helvetica, sans-serif" size="4">Describe what
happens to the gas when you enlarge the box.</font></strong>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">Click the
button "Show a trajectory," observe the atom, take a snapshot and as a
caption give two reasons why the atom changes the direction it is moving.
Fill the snapshot image in the box below.</font></strong>
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