How can we hold bottom of the test tube in hand,when uppermost layer of water in test tubeis boiling
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Use your bare fingers to hold the bottom of a test-tube containing water. Tilt the test-tube over a flame so that you can heat the water in the upper part of the test-tube. You can hold the bottom of the test-tube until the water in the upper part boils because water is a poor conductor of heat.
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