megaohm centimeter
Electrical resistivityexact by definition
The megaohm centimetre is one million ohm centimetres, exactly 1e4 ohm metres. It is the standard purity unit for high-purity water, where 18.2 MΩ·cm at 25 degrees Celsius is the theoretical maximum set by water's own self-ionisation and the number every polishing loop is designed to hold. The conversion is exact.
Watch out: Resistivity in megaohm centimetres and conductivity in microsiemens per centimetre are reciprocals of the same measurement, so 18.2 MΩ·cm is 0.055 μS/cm. Both are strongly temperature dependent and are reported compensated to 25 degrees Celsius. Neither says anything about dissolved gases, organics or particles, which is why semiconductor-grade water is specified on total organic carbon and particle count as well.
| 1 | 10,000 |
One megaohm centimeter in every electrical resistivity unit
| 10,000,000,000,000 | nanoohm meter (nΩ·m) | |
| 6,015,300,000,000 | ohm circular mil per foot (Ω·cmil/ft) | |
| 1,000,000,000,000 | microohm centimeter (μΩ·cm) | |
| 10,000,000,000 | microohm meter (μΩ·m) | |
| 10,000,000,000 | ohm square millimeter per meter (Ω·mm²/m) | |
| 1,000,000,000 | milliohm centimeter (mΩ·cm) | |
| 1,000,000 | ohm centimeter (Ω·cm) | |
| 10,000 | ohm meter (Ω·m) | |
| 1,000 | kiloohm centimeter (kΩ·cm) | |
| 1 | megaohm centimeter (MΩ·cm)this unit |