Search results
Results From The WOW.Com Content Network
Electrical conductivity is a measure of how well a material transports an electric charge.This is an essential property in electrical wiring systems. Copper has the highest electrical conductivity rating of all non-precious metals: the electrical resistivity of copper = 16.78 nΩ•m at 20 °C.
The 20 °C value is only an approximation when used at other temperatures. For example, the coefficient becomes lower at higher temperatures for copper, and the value 0.00427 is commonly specified at 0 °C. [53] The extremely low resistivity (high conductivity) of silver is characteristic of metals.
As quoted from various sources in an online version of: David R. Lide (ed), CRC Handbook of Chemistry and Physics, 84th Edition.CRC Press. Boca Raton, Florida, 2003; Section 12, Properties of Solids; Thermal and Physical Properties of Pure Metals / Thermal Conductivity of Crystalline Dielectrics / Thermal Conductivity of Metals and Semiconductors as a Function of Temperature
The standard is most often used as a comparative property in the specification of the conductivity of other metals. For example, the conductivity of a particular grade of titanium may be specified as 1.2 % IACS, meaning that its electrical conductivity is 1.2 % of the copper specified as the IACS standard. [2]
29 Cu copper; use 2.15 nΩm 15.43 nΩm 16.78 nΩm 17.12 nΩm 17.25 nΩm ... 273 K (0 °C) 293 K (20 °C) 298 K (25 °C) 300 K (27 °C) 500 K (227 °C) References
*It happens that the online record has the thermal conductivity at 30 Kelvins and to the c axis posted at 1.36 W⋅cm −1 K −1 and 78.0 Btu hr −1 ft −1 F −1 which is incorrect.
Pourbaix diagram for copper in uncomplexed media (anions other than OH- not considered). Ion concentration 0.001 m (mol/kg water). Temperature 25 °C. Cu 2+ + 2 OH − → Cu(OH) 2. Aqueous ammonia results in the same precipitate. Upon adding excess ammonia, the precipitate dissolves, forming tetraamminecopper(II): Cu(H 2 O) 4 (OH) 2 + 4 NH 3 ...
Generally the conductivity of a solution increases with temperature, as the mobility of the ions increases. For comparison purposes reference values are reported at an agreed temperature, usually 298 K (≈ 25 °C or 77 °F), although occasionally 20 °C (68 °F) is used.