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Why do they use black tubes for solar geyser
Black tubes absorb the radiant heat from the sun and conduct water that's inside tubes
Why do insulating materials contain small holes
The air trapped inside them is a very poor conducted of heat since it is trapped in small pockets there can be no convection.
Why are carpets good insulators and not cement
Concrete floor is much better conducter of heat than the carpet that has trapped air pockets
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