Question: 1 litre water how many kilogram?
Answer: One litre of pure water will weigh exactly 1000 grams i.e., one KG. The definition of the unit Kilogram is ' the weight of one litre water at zero degrees centigrade'. However water weight will increase with dissolved salts. One litre sea water will weigh about 1030 grams or 1.03 Kgs.