per milliliter
Number densityexact by definition
The per millilitre is exactly 10⁶ m⁻³, the same value as per cubic centimetre and the label microbiology and cell culture actually use. A confluent mammalian culture is around 10⁶ cells/mL, and drinking water plate counts are reported as CFU/mL.
Watch out: Colony forming units per millilitre are not cells per millilitre. A CFU is whatever grew into one colony, which may have been a clump of a hundred cells or a single one that happened to be culturable, and most environmental bacteria never grow on a plate at all.
| 1 | 1,000,000 |
One per milliliter in every number density unit
| 1,000,000 | per cubic meter (m⁻³) | |
| 28,316.8 | per cubic foot (ft⁻³) | |
| 1,000 | per liter (L⁻¹) | |
| 1 | per cubic centimeter (cm⁻³) | |
| 1 | per milliliter (mL⁻¹)this unit | |
| 0.001 | per microliter (μL⁻¹) | |
| 0.001 | per cubic millimeter (mm⁻³) | |
| 3.72193e-20 | amagat (amagat) | |
| 1.00000e-24 | per cubic angstrom (Å⁻³) |