why can we use mercury but not water as a liquit in a thermometer?
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Below 0oC and above 100oC can't measure by using the water. The most metals are solids at room temperature but the mercury is liquid form because it has high coefficient of expansion. The mercury does not sticking to capillary wall of thermometer can easily measure temperature accurately.
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Explanation:
Mercury is used in clinical thermometers because mercury rises with the slightest rise in temperature but water does. water cannot be used in thermometres.
water also undergoes anamolous expansion while mercury does not
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