The stem of the thermometer is not perfectly round for two reasons. One so it will not roll off and fall, and two, the flat area acts as a magnifying glass to make the hollow shaft in the stem appear larger.
The stem of a thermometer is not designed as a magnifying glass. The stem of a thermometer is typically narrow to allow for more accurate temperature readings, as it reduces the amount of time it takes for the reading to stabilize. The magnifying glass may be used for easier reading of the temperature scale on the thermometer.
The glass stem of a thermometer is not designed to act like a magnifying glass. Its purpose is to contain the temperature-sensitive liquid or metal that expands or contracts with temperature changes to provide a reading on the thermometer scale. Magnifying glasses have a different purpose of magnifying objects placed beneath them.
The glass stem in a clinical thermometer acts as a magnifying glass because it is made of a transparent material that can refract and focus light. When you hold the stem over a scale, it magnifies the divisions on the scale, making it easier to read the temperature.
So you can read it more easily.
a lab thermometer did not have a constriction as compared to clinical thermometer. it have a wide range of measurement and usually contains alcohol
mercury
A clinical thermometer may crack in hot water due to rapid expansion of the glass material when exposed to extreme temperatures. The sudden change in temperature causes stress on the glass, leading to cracks or breakage. Additionally, if the thermometer is not designed to withstand high temperatures, it may not be able to handle the heat and crack.
The glass on the bulb of a clinical thermometer is thin to allow for rapid heat transfer between the body and the thermometer. This ensures that the thermometer can quickly and accurately measure the body's temperature. Additionally, thin glass reduces the risk of the thermometer causing discomfort when inserted into the mouth or underarm.
MERCURY
mercury
Mercury does not fall or rise in a clinical thermometer when taken out from the mouth because of the KINK present in it.
Laboratory thermometers can measure wide variety of temperature, whereas a clinical thermometer has a range between 95 to 105 Fahrenheit. Clinical thermometers are made to be used in a hospital to accurately determinebody temperature. They are often digital. Lab thermometers are made of metal or glass and usually don't give you an accurate reading as much as a "ball park". Clinical thermometer may have mercury but lab thermometers usually have alcohol .