Beckmann thermometer can not be used to measure small differences in temperature. It can measure only change in temperature, not absolute temperature.
Features of Beckmann thermometer
Listed below are few features of the thermometer
- Beckmann thermometer’s length is usually 40 – 50 cm.
- The temperature scale typically covers about 5 °C and it is divided into hundredths of a degree.
- The peculiarity of Beckmann’s thermometer design is a reservoir (R on diagram) at the upper end of the tube, by means of which the amount of mercury in the bulb can be increased or diminished so that the apparatus can be set to measure temperature differences at either high or low-temperature values.