One liter is how many kilogram?

Answer 1

You need to know one liter of what. One liter of water weighs 1 kg at 4 degrees Celsius and one standard atmospheric pressure. For other liquids, multiply 1 kg by its specific density to get to its mass (at the same temperature and pressure).

Answer 2

"Liter" is a measure of volume, space, or capacity. "Kilogram" is a unit of mass.

They have different physical dimensions, measure different types of quantities,

and can't be converted to each other.

In order to relate a volume and a mass, you'd have to know what specific substance

is involved, as well its temperature and the pressure on it.

For example:

One liter of water at standard temperature and pressure has one kilogram

of mass. But one liter of water under other conditions, or one liter of any other

substance, doesn't.