Thermometers are mechanical temperarure-sensing devices because they produce some type of mechanical action or movement in response to temperature changes.There are many types of thermometers,including the familiar liquid-in-glass thermometers;liquid-,gas-,and vapor-filled systems;and bimetallic thermometers.Liquid-in-glass thermometers are easy-to-read and are accurate and stable.Consequently,these thermometers often see duty in laboratories to monitor baths and to check calibrations of other temperature sensors.Thee bulb is usually a thin-walled glass chamber that serves as a reservoir for the liquid.
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