Special resistor materials: mercury, Physics

Mercury:    

 

 

 

 

 

Atomic number

80

Symbol

Hg

Atomic weight

200.59

Discovery

Known to the ancient Hindus and Chinese. Mercury has been found in Egyptian tombs dating to 1500 B.C. The Greeks used mercury in ointments. The roman used mercury in cosmetics.

Electronic configuration

5d10

Word origin

Named for the planet Mercury Hg is the symbol for "Hydrargyrum" which means liquid silver.

Melting point

-38.8420C

Boiling point

356.580C

Specific gravity

13.546 (200C)

Electrical resistivity

0.95*10-6 ohm-m

Properties:

1.      Mercury is one of the few elements that are liquid at ordinary room temperatures.

2.      It is the heaviest known elemental liquid.

3.      Mercury is a silvery white metal.

4.      It is a relatively poor conductor of heat, but a fair conductor of electricity.

5.      It readily forms alloy with other metals, called amalgams.

6.      Mercury and its compounds absorbed across unbroken skin through the respiratory tract. It acts as a cumulative poison.

Uses: Mercury is amalgamated with gold to facilitate the recovery of gold from its ores. Mercury is used to make thermometers, diffusion pumps, barometer, mercury vapour lamps, mercury switches, pesticides, batteries, dental preparations, antifouling paints, pigments and catalyst. It is used in mercury are rectifier and gas filled tubes. It is also used as liquid contact material in electrical switches etc.

Sources: Mercury rarely occurs freely in nature. Its chief one is cinnabar, HgS. Mercury is obtained from cinnabar by heating the cinnabar in air and condensing the vapour.  

Posted Date: 7/21/2012 7:52:09 AM | Location : United States







Related Discussions:- Special resistor materials: mercury, Assignment Help, Ask Question on Special resistor materials: mercury, Get Answer, Expert's Help, Special resistor materials: mercury Discussions

Write discussion on Special resistor materials: mercury
Your posts are moderated
Related Questions
Conservation of Energy Conservation of energy is not all about turning off the computer when you are not using it. Energy is not created or destroyed, it just changes forms. En

Give any two methods of electric lines of force. Sketch them for an isolated positive point charge.

(a) Potential energy : An electron operates some potential energy due to this found in the field of nucleus potential energy of electron in nth orbit of radius rn is given by

Classical free electron theory: The free  electron theory of metals using classical laws was developed by Dude and Lorentz in the beginning of last century. That time the va

can i get this job?


An object with a mass of 5 kilograms is a distance of 5 meters above the surface of the earth.  If the acceleration because of gravity is 10 meters per second squared, the pote


Quantum Theory of Light: Wave theory failed to describe some new effects in 19th century. A German Physicist Max Plank gave theory about the nature of light. 1. Light is emi

Q.   Explain with the help of diagram and experiment arrangement to produce Newton's rings.