The working principle of the guest glass thermometer is based on the principle of thermal expansion and cold contraction. When the temperature rises, the mercury column rises, and vice versa. Therefore, by observing the position of the mercury column, we can know the specific value of body temperature.
To use a glass thermometer, you first need to shake the thermometer to let the mercury return to the ball. Then, place the thermometer in your mouth or under your arm and wait a few minutes until the thermometer reading stabilizes. When reading body temperature, it is necessary to keep the thermometer in a horizontal position to avoid errors.
Although the guest glass thermometer is convenient to use, there are some things to pay attention to during use. First of all, it is necessary to check the integrity of the thermometer before use to avoid air leakage or rupture. Secondly, after use, it needs to be cleaned with clean water, and the mercury column should be thrown back to the ball. It is necessary to keep the thermometer out of the reach of children, so as not to cause mercury poisoning after breaking.
