Mercury cas：7439-97-6 also known as mercury, is a silvery liquid metal that can evaporate at room temperature and is toxic. It is mainly derived from the extraction of cinnabar ore, and a small amount is obtained from natural mercury.

Medical field: In the past, mercury was used for disinfection, sterilization and treating certain diseases, such as syphilis. However, due to its toxicity, it has been largely phased out now. In medical equipment, some measuring instruments such as traditional blood pressure monitors and thermometers once used mercury, but due to safety concerns, they are gradually being replaced by electronic devices.

Scientific research: Mercury is still being used in some biomedical studies, but it must be strictly controlled to avoid toxic effects.

Industrial applications: Mercury is used in the manufacture of batteries (such as alkaline batteries, lithium batteries, nickel-hydrogen batteries), electronic components (such as capacitors, resistors, transformers, relays, contactors, etc.), coatings (such as paints, lacquers, automotive paints, etc.) and as a metal catalyst (such as for hydrogenation reactions, olefin catalytic reactions, alkyne catalytic reactions, etc.).

Other uses: Mercury can also be used as a preservative, serve as an electrode in some electrolytic devices, be utilized in the production of chlorine and potassium hydroxide, be used to manufacture liquid mirror telescopes, switches, pesticides, etc.

It should be noted that mercury is highly toxic. Therefore, when using it, one must be extremely cautious and strictly follow the relevant safety regulations and operating procedures.