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Similarities between laboratory thermometers and thermometers:

1: The principle is the same: both of them are made by using the property that liquid expands when heated and contracts when cooled (when the temperature rises, the liquid in the bubble expands and the liquid level rises; When the temperature drops, the liquid in the bubble contracts and the liquid level drops).

2: It's all in degrees Celsius.

The difference between a laboratory thermometer and a thermometer;

(1) range is different: for experiment, the general range of thermometer is -20C- 1 10C. The range of thermometer is 35C-42C, because the range of human body temperature is generally between 35-42C.

(2) Different calibration values: the calibration value of the experimental thermometer is 1C, while the calibration value of the thermometer is 0.1c..

(3) Different substances: The liquid in the experimental thermometer is generally kerosene (generally dyed red for easy observation), and the liquid in the thermometer is generally mercury.

(4) Different structure: The basic structure of the experimental thermometer is that the upper part of the glass bulb is a uniform thin tube. There is a thin neck above the glass bulb containing mercury in the thermometer, and the mercury expansion of the thermometer can rise to the glass tube above through the neck. When the thermometer leaves the human body, the mercury cools and contracts, and the mercury column cannot return to the glass bulb in time, so it is disconnected at the constriction, which still indicates the temperature of the human body. So the thermometer can be read far away from the human body.

(5) Different usage: The experimental thermometer can't read without the tested object, but can read without the human body. The thermometer should be thrown down several times by hand before use, and other common thermometers should not be thrown down before use.