Which one of the following is a bad Thermal Conductor?
Glass
Metals conduct heat well because their free electrons rapidly transfer thermal energy. Aluminium, Copper and Silver are all metals with high thermal conductivity (Silver ~429, Copper ~401, Aluminium ~205 W/m·K).
Glass, an amorphous non-metal, lacks free electrons and conducts heat only through slow lattice vibrations (~0.8 W/m·K), making it a poor thermal conductor (good insulator). Hence Glass is the bad thermal conductor.
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Important Questions from Heat and Transfer
In summer season, the top and outer surface of the house are painted white because:
Which of the following is a process in which hot, less dense materials rise upward and are replaced by colder, more dense materials?
What is the heat released by a heating filament rated 24 W when it is kept on for 6 seconds?
Space is left between logs of wood when they are burnt, so that:
On a hot summer afternoon, the tent made up of fabric will be preferred as white colour is:
