The working principle of the V-line thermometer is mainly based on the thermal expansion properties of the liquid when the temperature of the measured object changes, the volume of the temperature-sensing liquid in the thermometer changes accordingly, which causes the liquid column in the glass tube to rise or fall. By reading the position of the liquid column on the thermometer scale, the temperature value of the object to be measured can be determined. Applications for this type of thermometer include shipbuilding, ventilation equipment, hydraulic equipment and various types of industrial piping.
