How much does 1 litre of water weigh?
The density of water is 1000 kg/m3 , which is the same as 1
kg/L. So 1 liter of water weighs 1 kg.
* * * * *
Not true because a kilogram is a measure of mass - NOT of
weight. The mass of one litre of water is approx 1 kilogram and ON
THE SURFACE OF THE EARTH it would weigh around 9.8 Newtons. On the
surface of the moon, it would weight around 1.6 Newtons and in
outer space it would be weightless.
Besides, the density of water, at 1 atmosphere has a maximum
value of 999.9720 kg/metre3 - near enough, but not quite 1,000.