| M | Mass of mixture (usually defined locally) | kg |
| V | Volume of mixture (usually defined locally) | m3 |
| Vo | Reference (original homeostatic) volume of mixture (usually defined locally) | m3 |
| ρ | Spatial mass density of mixture: current mass of mixture per unit current volume of mixture | kg · m−3 |
| ρR | Referential mass density of mixture: current mass of mixture per unit reference volume of mixture | kg · m−3 |
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