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Thermometer
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Thermometers measure temperature. They may be fitted with a glass tube containing mercury or alcohol (The Thermometers with ‘alcohol ‘ have the toluol or the creosote as liquid, The alcohol is boiling at 78°C; this do not allow to measure temperature above 78°C) . Bimetal thermometers have a helicoidally spring. The two metals react differently to temperature, winding the spring to a lesser or greater degree. Electric resistance depends on temperature.
