How to read the scale of mercury thermometer

The scale of mercury thermometer depends on the position of mercury column.

The calibration range of mercury thermometer is from 35 degrees to 42 degrees, and each degree is divided into ten squares, each of which represents 0. 1 degree. When the mercury thermometer measures the body temperature, hold the non-mercury end of the thermometer and rotate the thermometer. When you see the scale and the mercury column. According to the position of the mercury column, if the mercury column is between 36 and 37 degrees, count the cells between 36 and 37 degrees. If it is four squares, the measured temperature is 36.4 degrees.

Mercury thermometer often appears mercury column fracture phenomenon, the elimination method is as follows:

1. Cold patching method: insert the temperature measuring bag of the thermometer into the mixed liquid of dry ice and alcohol (the temperature shall not exceed -38℃) for cold shrinkage, so that all mercury in the capillary will shrink into the temperature measuring bag.

2. Hot repair method: slowly insert the thermometer into a thermostatic bath with a temperature slightly higher than the upper limit of measurement, so that the broken part of mercury is connected with the whole mercury column, then slowly take out the thermometer and gradually cool it to room temperature in the air.