Answer:
Take a test-tube. Half fill it with cold water. Now drop in it a cube of ice wrapped in a wire gauze. It sinks to the bottom. Hold the top end of the test-tube with a test-tube holder. Heat it over a flame. It will be noticed that water starts boiling but ice is not fully melted. It means that heal has not been transferred through the molecules of water. This shows that water is a bad conductor of heat.
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