Derek Broughton wrote on Jan 17:

John Bachman wrote on Jan 16:

wrote on Jan 16:
wouldn't it be simpler, 1000g = 1kg = 1l?

You have confused the measurements of volume and weight. 1000
milli-liters = 1 liter. 1000 grams = 1 kilogram.

Not really. For water, the figures are the same.

1kg = 1l ONLY at the tripple point of water which is 3.98C. At room
temperature there is a .2% discrepancy. At the boiling point there is a
4.4% discrepancy since the water expands and liters don't.

So one could say that 1kg of water is approximately 1 liter in volume.

As John pointed out you can never say 1kg = 1l. It is like saying that
1 apple = 1 pear.
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