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What do you think of mercury thermometer?

Mercury thermometer view method is as follows:

1, when reading the thermometer, keep the thermometer in the horizontal position of the line of sight.

2. When reading the thermometer scale, the line of sight should be level with the upper surface of the liquid column in the thermometer, otherwise the measurement result will be inaccurate.

3. When using mercury thermometer to measure body temperature, the mercury column must be thrown below the minimum scale before measurement.

4. If you need to measure the oral temperature, put the thermometer under your tongue, close your lips, and take out the reading after 5 minutes.