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A test tube is filled with tap water (about 25oC). An ice block is placed in the test tube and is kept at the bottom of the test tube by means of a wire gauze.

Next (without delaying too much since the ice block would melt completely!), the test tube is bent and the upper end of the test tube placed in a Bunsen flame.

It is found that the water at the upper end boils before the ice block melts. This shows that water is a poor conductor of heat.

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13y ago

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