It's cheaper and it isn't paricularly harmful if broken.
Mercury, if it enters your body, causes severe brain problems, and is usually deadly, so it is a poisonous material. it is no longer used in thermometers because thermometers were breaking and too many people were dying.
Common fluids used to measure temperature include mercury, alcohol, and thermochromic liquids. Mercury is toxic and less commonly used now, while alcohol-based fluids are safer alternatives. Thermochromic liquids change color with temperature variations, making them visually helpful for temperature readings.
Yes, oral mercury thermometers can lose accuracy over time due to breakage or leakage of the mercury inside. It is recommended to check the thermometer for accuracy periodically or replace it if it shows signs of damage.
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How do you replace the orifice tube on a 2000 Mercury Marquis
Sometimes it has to be removed, sometimes you can loosen it on one side to be able to slip the belt past to remove and replace it.
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Mercury does not replace copper in a reaction between copper II sulfate and mercury because mercury is below copper in the reactivity level of the periodic table.
Mercury, also known as "quicksilver", was used to give top hats a sheen back in the 18th or 19th century. It was also believe to have some medical purposes; it is found now that that is absolutely false and can be deadly. The vapors from the process in which top hats were coated also was known to make people suffer dementia, hence the term "Mad as a hatter" or "Mad Hatter" from Alice in Wonderland.
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Digital thermometers should have a plastic sleeve, but even with that, you should use an alcohol swab to thoroughly wet, rub it and allow it to air dry after each use. Some of the digitals will have battery and "mother board" problems if you wash them in soapy water. The old-timey mercury thermometers and modern non-digital thermometers can be soaked in alcohol over night or washed with warm soapy water and then swabbed with alcohol, allowed to dry and returned to their cases. Since you can get digital thermometers for less than 10.00, it is a good idea to have a thermometer for each person in your family....and if you are really germ-phobic you can replace them after every illness...but that is overkill, IMO.