Thermometer (English:Thermometer) is a tool for measuring the levels of heat when heated and contract when the ground heat The liquid used in glass bulb of the thermometer, the packing The mercury or alcohol mixed with red.To grow up in a small tube above the bulb glass. And it will shrink to be in the bowl as if the temperature drops
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.Why use alcohol or mercury thermometer for liquid packing in both sensitive to the change of temperature, and not the island surface of the glass tube. But if other types, such as liquid water island surface glass tube.Will get stuck in vitro, won't come back to the bulb
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