Never, they are still legally available to purchase in the United States. If you are asking this from outside the US, I cannot help you.
For those who are interested in the world outside the USA,
mercury thermometers were directed to be banned, at least for medical use,
in the EU in 2009, and bans were definitely implemented by these countries:
Austria
Bulgaria
Denmark
Italy
Estonia
Latvia
Lithuania
Poland
Portugal
Romania
Slovakia
Spain
Sweden
In the EU, only the Czech Republic has stated it's intention not to implement the ban, while most other EU countries are believed to be in the process of joining the majority.
Elsewhere, the Philippines is engaged in phasing out mercury thermometers.
This in spite of the fact that the quantity of mercury, or mercury vapour, which might be ingested or inhaled as a result of a mishap with a mercury thermometer, is so small as to pose a negligible health hazard.
it is used in thermometers(sorry if i spelled thermometers wrong)
Thermometers are the instrument that is often filled with mercury, colored water, or alcohol. Most early thermometers were made with mercury.
Mercury is a liquid metal used in thermometers. However, it becomes a solid at -37.9 F and it can cause mercury poisoning if ingested or inhaled. Therefore, most theremometers use ethyl-alcohol or a plastic strip covered with liquid crystals (called a liquid crystal thermometer).
Person who make thermometers and viewing mirrors.
A barometer measures air pressure. A mercury one does so by taking a tube full of mercury which is inverted into a dish of mercury. The height of mercury remaining in the tube is a measure of the air pressure.
no,digital thermometers don't have mercury whereas clinical thermometers have mercury.
Mercury is not used in thermometers, because mercury is poisonous.
Mercury in thermometers is in a liquid state, since mercury is liquid at room temperature.
Mercury is common in both fish and thermometers. Although nowadays they make thermometers without mercury in them.
Digital thermometers have replaced mercury thermometers because mercury is toxic. [Personal commentary: digital thermometers are not accurate and mercury thermometers are so how many people are being harmed by not knowing their temperature versus how many would be harmed by the mercury if accurate thermometers were still used?]
In ordinary bulb thermometers, yes.
Mercury thermometers are rarely used, except in lab thermometers. For human use, they have been replaced by dyed alcohol glass thermometers, or electronic digital thermometers.
the element used in termometers is Mercury.
In normal and some medical thermometers Mercury is used. That is why you may want to consider using electric thermometers which are more commonly used. They use no mercury.
Digital thermometers measure electrical resistance and Mercury thermometers measure thermal expansion.
When mercury filled thermometers break, the mercury is released. Mercury is toxic to people, pets and the environment. There is a long history of mercury from broken thermometers and other medical devices being improperly dealt with, or even ignored. Since there are adequate replacements for mercury thermometers, OSHA, EPA, AMA and others discourage the use of mercury thermometers and encourage their replacement with thermometers using other technologies.
Mercury is used in thermometers.