ohm square millimeter per meter
Electrical resistivityexact by definition
The ohm square millimetre per metre is the same size as the microohm metre, exactly 1e-6 ohm metres, written the way a cable schedule works: resistance equals resistivity times length in metres divided by conductor area in square millimetres. Copper is taken as 0.01724 Ω·mm²/m at 20 degrees Celsius in IEC practice and 0.0175 in older European tables. The conversion is exact, following from the exact definition of the millimetre.
| 1 | 0.000001 |
Where the unit came from
The form survives because cable is sold by cross-sectional area in square millimetres. Keeping the unit in the shape of the calculation means a 2.5 mm² conductor 30 m long comes out in ohms with no prefix arithmetic at all.
One ohm square millimeter per meter in every electrical resistivity unit
| 1,000 | nanoohm meter (nΩ·m) | |
| 601.53 | ohm circular mil per foot (Ω·cmil/ft) | |
| 100 | microohm centimeter (μΩ·cm) | |
| 1 | microohm meter (μΩ·m) | |
| 1 | ohm square millimeter per meter (Ω·mm²/m)this unit | |
| 0.1 | milliohm centimeter (mΩ·cm) | |
| 0.0001 | ohm centimeter (Ω·cm) | |
| 0.000001 | ohm meter (Ω·m) | |
| 1.00000e-07 | kiloohm centimeter (kΩ·cm) | |
| 1.00000e-10 | megaohm centimeter (MΩ·cm) |
Solvers that use electrical resistivity