UTF-8Phase Change: Evaporative Cooling192192192
Evaporation
Important Instruction:
1. After finishing the activity, close the window.
2. It will ask you to save the snapshots.
3. Save it with a name.
4. Then back to the original Learning module.
11Tw Cen MT204 0 02611org.concord.modeler.PageTextBox750.026.0<html>
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<title>Evaporation</title>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">A cup of
hot drink cools down faster if we open the cover. Closing the cover
will keep it warm for longer in winter, on the other hand. This has
to do with something called <b>evaporative cooling</b>.<br><br>Evaporation
involves a change of state from liquid to gas. This page will
provide an atomic-scale explanation for evaporation and its cooling
effect.</font>
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<img width="306" height="186" src="cups.gif">
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-15235a1org.concord.modeler.PageTextBox750.030.0<html>
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<font color="#a65d2c" face="Verdana, Arial, Helvetica, sans-serif" size="5"><strong>A
simple experiment</strong></font>
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Press the Run button and observe what happens. The leftmost atom is given
the highest speed (represented by the length of the arrow on it). The
rightmost atom is given the lowest speed. The middle ones are given
intermediate speeds. When an atom rises to the Escape Region (represented
by the area above the dashed line), it will leave the model.
<p>
<font color="#0000ff">Take snapshots of important momnets and describe
why it is important in the process.</font>
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false1org.concord.mw2d.activity.AtomContainerpage8$0.mmlfalsefalse1org.concord.modeler.PageButtonRunClick to kick the upper 4 atoms with different speeds.Nonefalseorg.concord.mw2d.models.MolecularModel0trueExecute MW scriptorg.concord.modeler.PageButtonStopStop the simulation.4723Nonefalseorg.concord.mw2d.models.MolecularModel0Execute MW scriptorg.concord.modeler.PageButtonResetReset to the intial condition.5323Nonefalseorg.concord.mw2d.models.MolecularModel0Execute MW scriptorg.concord.modeler.PageButtonTake a snapshot15023Nonefalseorg.concord.mw2d.models.MolecularModel0Take a snapshot1org.concord.modeler.PageTextBox750.030.0<html>
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<font color="#a65d2c" face="Verdana, Arial, Helvetica, sans-serif" size="5"><strong>A
more realistic model</strong></font>
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false1org.concord.modeler.PageTextBox750.0100.0<html>
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In the following model we put many molecules in a container, which is
initially covered from the top to prevent evaporation. Run the model for a
while and observe the bar graph on the right, which represents temperature
of the system. Then press the "Remove the cover. Let it evaporate" button
and observe the change of the bar graph.
<p>
<font color="#0000ff">Take snapshots of important momnets and describe
why it is important in the process.</font>
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false1org.concord.mw2d.activity.AtomContainerpage8$1.mmlfalsefalseorg.concord.modeler.PageBarGraph1Kinetic Energy/ParticleTemperature (Celsius)20.05true11594.0-273.0100172true510true-1-100000.0300.0238.383008241653441org.concord.modeler.PageButtonRunRun the simulation.4423Nonefalseorg.concord.mw2d.models.MolecularModel1Execute MW scriptorg.concord.modeler.PageButtonStopStop the simulation.4723Nonefalseorg.concord.mw2d.models.MolecularModel1Execute MW scriptorg.concord.modeler.PageButtonResetReset the simulation.5323Nonefalseorg.concord.mw2d.models.MolecularModel1Execute MW scriptorg.concord.modeler.PageButtonRemove the coverRemove the cover and start the evaporation process.14023Nonefalseorg.concord.mw2d.models.MolecularModel1Execute MW scriptorg.concord.modeler.PageCheckBoxShow interactionsorg.concord.mw2d.models.MolecularModel1Show van der Waals interactionsorg.concord.modeler.PageButtonTake a snapshot15023Nonefalseorg.concord.mw2d.models.MolecularModel0Take a snapshot60.0580.00 0 255580.0580.0580.0580.0580.040.01org.concord.modeler.PageTextBox750.032.0<html>
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