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Login or Register   Heat and Temperature - Conductivity of materials

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Overview         (For age - group : Above 16 )

Conductivity varies for different materials , most of us have unknowingly touched hot metal object sometimes in our life, we know it gets hot quickly. The e-learning animation shows the determination of conductivity of different materials.

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 Category : Science Type : Animation Conductivity : The interactive e-learning animation details thermal expansion and explains its intricacies in detail using illustrative examples. Why cooking vessels are not provided with metal handles ? How do we compare the thermal conductance of different materials ? Explanatory Notes contain : Why are gases better insulators than liquids and liquids better insulators than solids? Why metals are good conductors of heat?
Snapshots
 Two container one with a metal handle and a wooden handle are put on burner Metal handle is too hot to touch Conductivity depends on material Wax layer on copper melts more than wood
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CONDUCTIVITY OF DIFFERENT MATERIALS

Suppose an experiment is conducted by taking a container with water inside having rods of different materials attached to it. The rods have a coating of wax on them, the length of the wax is same on each rod.

Now if a heating elements introduced into the water and after sometime the water will be heated. Simultaneously the wax will start melting and dripping from the rods. The wax will drip quickly from the copper rod and the amount of dripping will decrease successively for each rod, being least for the wooden one.

This is because each element has different conductivity.

Similarly If we touch the metal handle utensil we instantly remove our hand as we suddenly touched something hot.

Metals being good conductors of heat, transfers heat from one end to the other very quickly. Hence, the metal handle becomes too hot to touch.

Now if we touch the plastic or wooden handle utensil we'll be able to lift it from the oven.
Plastic and wood are insulator (a bad conductor of heat) and hence even though the metallic part of the utensil gets heated, the handle remains cold enough to be touched.

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