Analog thermometers are formed by a column or capillary with liquid, among which alcohol and formerly mercury stand out.
The liquid inside the capillary tube contracts or expands depending on the ambient temperature (rises or falls in the column). The lateral measurement scale indicates the temperature value that is recorded at that time. We find thermometers that measure the instantaneous temperature (at that time) and others that record the instantaneous temperature and also the maximum and minimum.
Depending on the manufacturing material and the temperature range of the column, they will be suitable for indoors or outdoors. So there are in wood, plastic, aluminum or stainless steel.
As for the material of the column, mercury is disappearing by legal regulations and now most of them are alcohol with red or blue dye.
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