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Heat Transfer Page2
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Experimenting with different heat conductors: Heat moves from a hot body to a cold body through several different processes, including:
conduction,
radiation, and
convection.
Heat transfer often involves a combination of these processes and is dependent on the nature of the material (e.g. phase, chemical structure).
Conduction is one of the most common heat transfer processes and occurs when a hot body comes into physical contact to a colder body. This process of heat transfer involves atoms that have higher kinetic energy transferring energy to those that have lower kinetic energy, through collisions.
The following model shows the change in temperature of two solids when they proceed to thermal equilibrium.
Choose a heat conductor through which heat flows from the hot solid to the cold one
Activity 2
Select a conductor from one of the radio buttons below the model and then click the ‘Run’ button to start a simulation.
Watch the graph at the right and observe how the temperatures of the two solids change. Take snapshots of important changes and explain why do you think the changes are important.
Take snapshots of the graph and explain why the lines cross and re-cross for some of the conductors. Hint: look at the time scale on the X axis.
Repeat this process for each of the conductors and carefully compare and analyze all of your readings. Which conductor allows the two solids to reach equilibrium fastest?
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<strong><font size="6" color="#CCC">Heat Transfer</font></strong><font size="6" color="#CCC">
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<strong>Q2. Why is heat transferred more quickly in solids than in gases?
Choose the best possible answer.</strong>
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The atomic structure of solids is more dense than that of gases, so the atoms come into contact with each other more often.
Heat is a substance that can move more quickly in a solid than in a gas.
Charged particles in solids cause faster heat transfer than in gases.
In solids, heat transfer occurs through both convection and conduction processes and is therefore faster.
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