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Gas Laws: Pressure-Volume Relationship
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Gas Laws:</strong> Pressure-Volume Relationship.</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><b>What is the relationship between pressure and the volume of a gas?</b>
The ideal gas law is represented by the equation <b>PV=nRT</b>.
The next few pages will give evidence for the relationship of the variables in the equation: pressure, volume, temperature and number of molecules. We will begin with pressure and volume.
What happens to the pressure when you increase or decrease the volume?</font></td>
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<strong><font size="5" face="Verdana, Arial, Helvetica, sans-serif" color="#a65d2c">Measuring
pressure when the volume changes</font></strong>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">A pressure
gauge is an instrument that measures pressure. It does so by converting
the effect of molecular collisions into something we can read. In the
model below, we set up a virtual gauge on one side of a movable wall. The
output is shown with a bar graph.</font>
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<b>Run for a minute, read the bar graph on the right, and then press this
button (➩). Repeat this for a few times.</b>
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Move the wall to increase the volume
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<strong><font size="4" face="Arial, Helvetica, sans-serif">How does
changing the size of the container affect the pressure?</font></strong>
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<strong><font size="4" face="Arial, Helvetica, sans-serif">Which of the
following best describe what occured as the volume increased?</font></strong>
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The strength and/or rate of collisions increased
The strength and/or rate of collisions decreased.
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