Wednesday, December 5, 2012

Liquid silver

                                           Liquid silver

Here i am not referring about silver jewellary.  There is an element which is also referred as liquid silver because of its appearance.
It is mercury. It is having the chemical name Hg and atomic weight of 80. It is also known as quick silver or hydrargyrum.  Because of the name hydrargyrum, it has got the chemical name Hg. Mercury is the only metal which is liquid at standard condition of temperature and pressure .
The only other element which is liquid at these conditions is Bromine. The element mercury is toxic. It is widely used in thermometers , barometers , sphygmomanometers etc. It is used in clinical conditions because of its toxic nature . It is also used in amalgam material for dental restoration.
Mercury   is also used in tubelights found in houses . Electricity is passed through mercury vapours in florescent lamps producing short wave ultraviolet light , which then causes the phosphor in the tube to fluoresce, making visible light. 

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