why are the pipes of solar heater and conductors of solar cooker painted black?
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Black colour absorbs heat very quickly. It does not allow heat to escape. The solar cookers are painted black so that maximum heat energy from sun is absorbed and food is cooked easily.
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Black colour is the best absorber of the heat energy. So, it is painted with black so that it absorb as much heat as can and cook food and heat water fast.
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