Search results
Results From The WOW.Com Content Network
Sometime around 1913, several copper samples from 14 important refiners and wire manufacturers were analyzed by the U.S. Bureau of Standards. The average resistance of the samples was determined to be 0.15292 Ω for copper wires with a mass of 1 gram of uniform cross section and 1 meter in length at 20 °C. In the United States this is usually ...
Oxygen-free copper is typically specified according to the ASTM/UNS database. [3] The UNS database includes many different compositions of high conductivity electrical copper. Of these, three are widely used and two are considered oxygen-free: C10100 – also known as oxygen-free electronic (OFE). This is a 99.99% pure copper with 0.0005% ...
Download as PDF; Printable version; ... 84.0 (20 °C) Sulfuric acid: 84–100 (20–25 °C) ... Calcium copper titanate >250,000 [14] References
Electrical conductivity of water samples is used as an indicator of how salt-free, ion-free, or impurity-free the sample is; the purer the water, the lower the conductivity (the higher the resistivity). Conductivity measurements in water are often reported as specific conductance, relative to the conductivity of pure water at 25 °C.
Also some de Vries authorities include John Webb, "Thermal Conductivity of Soil" November 1956, Nature Volume 178, pages 1074–1075, and M.W. Makowski, "Thermal Conductivity of Soil" April 1957, Nature Volume 179, pages 778-779 and more recent notables include Nan Zhang Phd and Zhaoyu Wang PhD "Review of soil thermal conductivity and ...
80 K (−193 °C) 273 K (0 °C) 293 K (20 °C) 298 K (25 °C) 300 K (27 °C) 500 K (227 °C) 3 Li lithium; use 10.0 nΩm 85.3 nΩm 92.8 nΩm 94.7 nΩm 95.5 nΩm CRC (10 −8 Ωm) 1.00 8.53 9.28 9.47 9.55 LNG (10 −8 Ωm) 9.28 WEL (10 −8 Ωm) (293 K–298 K) 9.4 4 Be beryllium; use 0.75 nΩm 30.2 nΩm 35.6 nΩm 37.0 nΩm 37.6 nΩm
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
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. So-called "compensated" measurements are made at a convenient temperature but the value reported is a calculated value of the expected value of conductivity of the solution, as if ...