How can we hold bottom of the test tube in hand when uppermost layer of water in test tube is boiling?
Online Answer
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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