A liter (L) is a unit of volume, while a kilogram (kg) is a unit of mass. The two units are not directly related to each other, as they measure different quantities.

To convert between liters and kilograms, you need to know the density of the substance you are measuring. Density is the mass of a substance per unit of volume. For example, if you have a liter of water, which has a density of 1 kilogram per liter, the mass of the water is 1 kilogram.