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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 ...
Ref. CRC: Values refer to 27 °C unless noted. Ref. CR2: Values refer to 300 K and a pressure of "100 kPa (1 bar)", or to the saturation vapor pressure if that is less than 100 kPa. The notation (P=0) denotes low pressure limiting values. Ref. LNG: Values refer to 300 K. Ref. WEL: Values refer to 25 °C.
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
The way that the dry soils get a lot lighter between Table I on page 99 and table IV on pages 102-3 is eventually explained by the fact that Table I has pycnometer densities. For those who may already see reasons to learn more about the thermal conductivities of the soils it is free from the Army Cold Regions Research and Engineering Laboratory.
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.
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 ...
This is a list of commercially-available battery types summarizing some of their characteristics for ready comparison. ... 50–92 [2] 3–20 [2] Zinc–carbon ...
1.000 589 86 ± 0.000 000 50 (at STP, 900 kHz), [1] ... (−30–25 °C) Hydrocyanic acid: 158.0–2.3 (0–21 °C) ... Calcium copper titanate >250,000 [14] References