UTF-8Heat and Temperature: Changing Temperature: Size Matters241240246
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Heat and Temperature:</strong> Changing Temperature: Size Matters</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">When energy is added to a substance, it often responds with a temperature rise. But how much can the temperature increase? It depends not only on how much energy is input but also on the size of the system.</font></td>
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The energy you add to a system will eventually be distributed evenly to
all the atoms in the system, ensuring that temperature is the same
everywhere. Given a certain amount of energy you input into the system,
the temperature rise depends on how big it is. In other words, how many
atoms it has.
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What to do:<br>(1) Hit the "Add energy" button <b>10 times</b>
and write down the temperature reading (estimate) on the bar graph.<br>(2)
Select "Small solid", and repeat (1).
<p>
In the view, redder shading means higher kinetic energy.
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falseorg.concord.mw2d.activity.AtomContainerpage5$0.mmlfalsefalsenoneorg.concord.modeler.PageBarGraphKinetic Energy/Particle CkTemperature (K)1true11594.0080252true816true-1000000.0800.00.76821776032738851org.concord.modeler.PageButtonAdd energy (1 eV)org.concord.mw2d.models.MolecularModel0trueExecute MW scriptorg.concord.modeler.PageButtonStoporg.concord.mw2d.models.MolecularModel0trueExecute MW scriptorg.concord.modeler.PageButtonResetorg.concord.mw2d.models.MolecularModel0trueExecute MW scriptorg.concord.modeler.PageRadioButtonLarge solidtruetrueorg.concord.mw2d.models.MolecularModel01203198377284Execute MW scriptorg.concord.modeler.PageRadioButtonSmall solid (half size)trueorg.concord.mw2d.models.MolecularModel01203198377284Execute MW script11org.concord.modeler.PageTextBox750.0300.0<html>
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From the above experiment, you have seen that the same amount of energy
causes the temperature of a smaller system to increase more. It can be
derived that, conversely, a small change of temperature of a large system
may absorb or release a large amount of energy. <b>El Niño</b> and <b>La
Niña</b> are two important temperature fluctuations in the surface
area of the tropical Eastern Pacific Ocean. Although the abnormal
temperature change is merely 0.5 K, both phenomena create enormous impact
to the climate. The ocean is a huge heat capacitor that stores so much
energy. Even if only a tiny portion of it changes, the effect to the life
on the planet will be significant.
<p>
Extra concepts you may be interested in learning, but <b>not required</b>:
</p>
<ul>
<li>
The measure of the energy required to increase the temperature of a
kilogram of a substance by 1 K is known as the <b>specific heat</b>.
</li>
<li>
When a substance undergoes a phase change, its temperature does not
change even though it absorbs or releases energy. The energy needed to
complete a phase change is known as the <b>latent heat</b>.
</li>
</ul>
Here is <font><a href="../../student/stateofmatter/latentheat2.cml">a
simulation</a> that shows the specifc heat and latent heat.</font>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">Write down the
temperatures of the large and small solid after you have hit the "Add
Energy" button 10 times. Is there any relationship between the readings
and the size of the solids?</font></strong>
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<strong><font face="Arial, Helvetica, sans-serif" size="4">If we have a
substance that is 10 times larger than another of the same type, how much
more energy it will release when it cools down one Celsius, compared with
the smaller substance?</font></strong>
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The same amount of energy.10 times more.5 times more.Cannot determine.1-373738Line1114true114true114true114true1org.concord.modeler.ActivityButtonCreate a report of my work for Day OneHeat and temperature report: Day onepage1.cml,page2.cml,page3.cml,page4.cml,page5.cmlCreate a report for a page group in a new window1org.concord.modeler.PageTextBox750.026.0<html>
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