Question

We have noted above that water is poor conductor of heat . How does then , the water , put in kettle , get heated up when it is put over a flame ?​

Answer 1

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Fluids generally do not conduct heat; they move it by convection, which is a different process.

The speed at which a substance heats up when subjected to heat is dependent on its constant-volume specific heat. (Usually the “constant-volume” descriptor is left out.) The specific heat of water is fairly high, and so it absorbs a fair amount of heat energy before warming up enough to suit you.