The density is a user-supplied assumption. DensityCalc proves the relationship between that assumption and the entered volume; it does not claim the value belongs to a particular liquid or material.
Use m = ρ × V
m = 0.8 kg/L × 2 L. Litres cancel exactly, leaving 0.8 × 2 kg = 1.6 kg.
The same mass is 1600 g
The exact kilogram-to-gram factor is 1000, so 1.6 kg × 1000 = 1600 g. Customary output uses the exact international pound factor before display rounding.
Verify the supplied density
If temperature, packing, composition, or measurement method changes the real density, the mass changes proportionally. Keep the source and conditions of a supplied density with any decision that depends on it.