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Why the bottom layers are kept of black colour of cooling vessels ?

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The bottom layers of cooking vessels are kept of black colour because it absorb maximum heat from gas - stove flame and to provide more heat to food in short time and cooking can be faster.
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KUMAR PRAKASHAN-THERMAL PROPERTIES OF MATTER-Question Paper (Section - D) (Answer following in brief :) Each carry 4 marks
  1. Why the bottom layers are kept of black colour of cooling vessels ?

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  2. In an experiment on the specific heat of a metal, a 0.20 kg block of t...

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