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The thermometer is a great tool.The thermometer was first invented in 1612.The thermometer is used to measure the air temperature.Most thermometers are closed glass tubes containing liquids such as alcolhol or mercury.Its a strip of metal with the glass tube in the middle of it.There is marks with numbers to deturmen what number the degrees is.The liquid in the tube, when the air around the tube expands and moves up the tube.