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प्रश्न
Why is the copper tube of a solar water heater painted black from outside?
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उत्तर
The copper tube of a solar water heater is painted black from outside so as to collect as much the sun's heat as possible, because a black surface absorbs more heat than a white surface.
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या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
