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When energy is not conserved: heating and cooling
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>When energy is not conserved: heating and cooling</strong></font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">The Law of Energy Conservation applies only to a system that does not interact with the outside world. If you heat or cool a system, its total energy will not conserve.</font></td>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">When a system
is being heated or cooled, it is exchanging energy with an external
source. For example, when a bottle of water is put inside an oven, its
total energy will increase. Before the water boils, the potential energy
does not change dramatically (<a href="script:page:0:message <t><font face=Verdana>The average distance between molecules does not change dramatically<br>before the water starts to boil. As the potential energy depends on<br>the locations of atoms, it does not change much.</font></t>;">why
so?</a>)and most of the energy will be used to raise the temperature.</font>
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Energy (eV)
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