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Energy, Boiling and Evaporation
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Phase Change :</strong> Energy, Boiling and Evaporation</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><b>What happens to the temperature when you add energy to a solid?</b><br>
In this page you can experiment with two ways of adding energy.
In the first, you pound on a very hard substance with a very heavy orange hammer.
In the second, you fire energetic atoms at a crystal.
Watch carefully for changes in the substance. Can you see it melt, evaporate, or boil? </font></td>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>How many hammer
blows were needed to turn the solid into a liquid?</strong></font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>After how many
blows was some of the crystal in gas phase? </strong></font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>How many blows
were needed to turn all the solid into a gas? </strong></font>
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<font size="5" color="#a65d2c" face="Verdana, Arial, Helvetica, sans-serif"><strong>Liquid,
gas and boiling</strong></font>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">In this model,
atoms are color-coded by their KE. White means low KE; red means high KE.
Each shot adds the same amount of energy to the system. Run the experiment
several times. Count the number of shots required to make a liquid, to
cause evaporation, to make a gas. Note how much energy is required to turn
all the liquid into gas. If you look carefully, you will see boiling. This
is where the material is liquid and looks a bit like Swiss cheese. </font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Write the three
most important observations here.</strong></font>
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<font size="4" face="Arial, Helvetica, sans-serif"><strong>Place here a
snapshot of boiling. </strong></font>
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<font size="4" face="Verdana, Arial, Helvetica, sans-serif">These models
show that phase changes require energy. Now, let's see how that is related
to coolaing by evaporation. </font>
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