1 liter weighs 0.96 kilograms.
Only if it is water, at specific temperature and pressure.
In general the question cannot be answered sensibly. A litre is a measure of volume, with dimensions [L3]. A kilogram is a measure of mass, with dimensions [M]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
As a simple mental exercise consider a litre of air and a litre of water. They will have very different masses.
Liters can't be converted to kilograms. Liters measure volume, while kilograms measure mass.
Kilograms can't be converted to liters. Kilograms measure mass, while liters measure volume.
Meters measure length, liters measure capacity, and kilograms measure weight.
kilograms
1 liters is 1000 grams
30 Liters of water weighs 30 kilograms. Other substances have different densities and weights.
3 liters of water weighs 3000 grams or 3 kilograms
140 litres of water is 140 kilograms
Kilograms
Liters can't be converted to kilograms. Liters measure volume, while kilograms measure mass.
To convert liters of sand to kilograms, you need to know its density. The density of sand varies, but on average it is around 1.6 kilograms per liter. So, 25 liters of sand would be approximately 40 kilograms.
The conversion between liters and kilograms depends on the density of the substance. For water, which has a density of 1 kg/L, 25 liters would weigh 25 kilograms. For other substances, you would need to know their density to convert from liters to kilograms.