The density, or more precisely, the volumetric mass density of caesium is 1879 kg/m³. This means that the mass of 1 m³ caesium is 1879 kg.
The weight (on earth) of 1 m³ caesium is 18432,99 N or 18,43299 kN.
Conversion Chart Metric System:
| Kilogram per cubic meter | 1879 | kg/m³ |
| Tonne per cubic meter | 1,879 | t/m³ |
| Gram per cubic meter | 1879000 | g/m³ |
| Milligram per cubic meter | 1879000000 | mg/m³ |
| Kilogram per cubic centimeter | 0,001879 | kg/cm³ |
| Gram per cubic centimeter | 1,879 | g/cm³ |
| Milligram per cubic centimeter | 1879 | mg/cm³ |
| Kilogram per litre | 1,879 | kg/L |
| Gram per litre | 1879 | g/L |
| Milligram per litre | 1879000 | mg/L |
| Kilogram per millilitre | 0,001879 | kg/mL |
| Gram per millilitre | 1,879 | g/mL |
| Milligram per millilitre | 1879 | mg/mL |
Conversion Chart British and U.S.:
| Pound per cubic yard | 3167,994 | lb/yd³ |
| Pound per cubic foot | 117,30597 | lb/ft³ |
| Pound per cubic inch | 0,06788827 | lb/in³ |
| Pound per U.S. gallon | 15,680255 | lb/gal |
| Pound per British gallon | 18,82758 | |
| Pound per U.S. bushel | 145,97951 | |
| Ounce per cubic yard | 50676,63 | oz/yd³ |
| Ounce per cubic foot | 1876,7452 | oz/ft³ |
| Ounce per cubic inch | 1,086062 | oz/in³ |
| Ounce per U.S. gallon | 250,8465 | oz/gal |
| Ounce per British gallon | 301,3916 | |
| Ounce per U.S. bushel | 2335,597 |
British Gravitational and English Engineering Units:
| Slug per cubic yard | 98,44081 | slug/yd³ |
| Slug per cubic foot | 3,64526 | slug/ft³ |
| Slug per cubic inch | 0,002110117 | slug/in³ |