Liquid In Glass Thermometers
The industrial liquid-in-glass thermometer is a glass tube with a liquid-filled bulb designed so that the liquid rises as its temperature increases. The liquid in the reservoir is often mercury or toluene, but may be another type of liquid. Less hazardous precision thermometers have been developed as an alternative to the high accuracy mercury models. Spirit-filled thermometers refer to instruments that contain an organic liquid colored with dye.
