What is the highest degree a thermometer can measure

The thermometer can measure up to 42°C.

This is because the body's temperature does not exceed a maximum of 42°C and a minimum of 35°C, so the thermometer is graduated from 35°C to 42°C, with each small cell representing 0.1°C. The thermometer is a mercury thermometer. It has a glass tube at the top and a glass bubble at the bottom. It contains pure mercury in the bubble and at the lower end of the tube, which is marked with a scale.

The body temperature of a normal person is maintained at a relatively constant state, and its normal range of fluctuation is as follows: the temperature of the oral cavity is 36-37°C, the temperature of the rectum is 0.3-0.5°C higher than the temperature of the oral cavity, and the temperature of the axilla is 0.3-0.5°C lower than the temperature of the oral cavity.

Expanded

Principle of the thermometer

When the "test meter", the lower end of the thermometer glass bubble and the human body in contact with the human body, because the human body temperature is higher than the temperature of the thermometer, the mercury in the glass bubble by the role of heat from the body, the volume of expansion, and rise along the glass tube. The mercury in the glass bubble is affected by the heat from the body and expands in volume, so it rises along the glass tube until the temperature of the mercury is the same as that of the human body.

The construction of the thermometer is very special, in the glass bubble and the thin tube where it meets, there is a very thin section of the shrinkage. When the thermometer leaves the body, the mercury becomes cold and shrinks, and the mercury column breaks off at the indentation, and the mercury above does not return, so the thermometer can continue to show the body temperature after leaving the body.

The reason why the thermometer dumped, and in the use of the pre-display higher than 35 ℃ must be dumped, dumping the purpose is to let the mercury retreat in the indentation with the mercury inside the glass bubble to connect, in order to use normally.

Baidu Encyclopedia - Thermometer