Ingenhauz's experiment to compare the thermal conductivity of different materials
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The apparatus has a number of rods, each made of a different metal. Accompanying information will identify them.
The rods must be coated with wax. This can be done by one of the following methods:
i Take the rods out of the water box and lay them in a chilled tin tray containing molten paraffin-wax. Remove quickly, hold vertically to allow the excess wax to drain off, and push them back into the water box.
ii Keep the rods in the water box. Paint each rod with a paint brush dipped in very hot molten wax. This produces an uneven, thick coating of wax, which must then be thinned by blowing a Bunsen flame up and down the rod. (This is a poor method, only successful in very skilful hands.)
A simple and easy-to-use set of conductivity bars is now available from Timstar. Four bars made of different metals are mounted on the same plastic support. Each bar has a liquid crystal strip showing temperature changes along the bar.
The rods must be coated with wax. This can be done by one of the following methods:
i Take the rods out of the water box and lay them in a chilled tin tray containing molten paraffin-wax. Remove quickly, hold vertically to allow the excess wax to drain off, and push them back into the water box.
ii Keep the rods in the water box. Paint each rod with a paint brush dipped in very hot molten wax. This produces an uneven, thick coating of wax, which must then be thinned by blowing a Bunsen flame up and down the rod. (This is a poor method, only successful in very skilful hands.)
A simple and easy-to-use set of conductivity bars is now available from Timstar. Four bars made of different metals are mounted on the same plastic support. Each bar has a liquid crystal strip showing temperature changes along the bar.
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