Why Not Measure The Temperature With A Mercury Thermometer In The Cold North? To Measure With An Alcohol Lamp?

Alcohol lamps are not used to measure temperature in cold areas.

Alcohol thermometer is filled with alcohol dissolved in dye because it is at one atmospheric pressure.

Mercury freezes at - 39 degrees Celsius and alcohol at - 117 degrees Celsius.

So when the cold mercury weather becomes solid, the linear change of thermal expansion and contraction can not indicate the temperature.

Mercury thermometers are seldom used as thermometers even in normal areas because Mercury is toxic.

The mercury vapor evaporated after crushing is not easy to handle, so the mercury thermometer is also used in alcohol thermometer or mechanical thermometer, which is mostly used in body thermometer because of the high surface tension of mercury.

When contracting into the vacuole, the mercury thermometer will be disconnected in the narrow slit, so that the thermometer indicator from the thermal environment into the cold environment will not become easy to read, but it will not go back on its own.

If you want to continue measuring, you have to push back the extra broken mercury column to the vacuole by shaking.

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