What are the pitfalls of using a mercury thermometer?

Mercury thermometer is a very common type of thermometer in life, and large and small hospitals and clinics have mercury thermometers.

As for the hidden dangers of mercury thermometers, I personally think that there is no need to be afraid or basically have no impact on us, after all, the popularity rate of this thing is too high, all over the country and even around the world, if there is a relatively large hidden danger, the National Health Bureau will not let this thing become a civilian product all over the place.

The principle of mercury thermometer is to use the sensitivity of mercury to temperature, which can show a small change in temperature. The thermometer head is filled with mercury, and then at room temperature it is "blocked" in the thermometer head by a relatively thin tube, if the outside temperature rises, the mercury will pass through the mouth of the thermometer head and then gradually until it reaches the corresponding temperature, so that you can know how many degrees your body temperature is at this time, the thermometer head is generally a glass product, which is used to protect the mercury inside from leaking and conducting temperature, and can also protect people from contact with mercury. So don't worry about causing discomfort to your body under normal use.

In addition, if the thermometer is broken, the mercury inside leaks out, it will not have much impact on the human body, although the mercury is said to be pervasive, but it is not directly drinking water silver when it is broken on the ground, mercury will volatilize in the air, do not come up to smell it when it is broken, although it will not do anything but try to avoid it. After the thermometer is broken, just clean it directly, sweep the glass residue clean, and then mop the floor to deal with it, don't worry too much.

All in all, the mercury thermometer is basically very safe, and you can use it with confidence without worrying about any major hidden dangers.

Mercury is a highly toxic substance, and a standard mercury thermometer contains 1 gram of mercury, and when all of this exposed mercury evaporates, it is enough to achieve a mercury concentration of milligrams per cubic meter in a large confined space of 15 square meters. Mercury concentrations reach milligrams per cubic meter. What is the concept?

The liquids commonly used in thermometers are mercury, alcohol, kerosene, etc., while thermometers are used.

Mercury, why is that?

The use of mercury in thermometers is not to reduce endothermy in thermometers: the specific heat capacity of mercury is compared.

Calculations show that the same volume of mercury, alcohol and kerosene absorb nearly equal heat when it rises by 1 degree Celsius.

Compared with general thermometers, thermometers have two special requirements: one is to be accurate.

Celsius, the second is to be able to leave the human body reading.

For this reason, the thermometer is constructed with "a very thin neck", but at the same time, it is necessary.

Mercury must be used. This is due to the high cohesion of mercury, which does not infiltrate the glass and can shrink when it shrinks.

Disconnect at the notch, thus achieving a reading out of the body. At the same time, mercury is denser and more homogeneous.

The inertia of the accumulated alcohol or kerosene is large, and it ensures that it can be thrown back into the glass bubble before use.

Reuse.