Mercury thermometers have been reliable tools for measuring body temperature for decades.
However, due to the toxic effect of mercury, their distribution was banned in 2009 and they were replaced by more modern, safer devices.
Why is mercury dangerous?
Mercury is an extremely toxic heavy metal that evaporates even at room temperature.
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Full article:
https://www.bikuci.hu/te-is-hasznalsz-meg-higanyos-homerot-ez-derult-ki-most-rola-001/