In article ,
keith_nuttle wrote:

wouldn't it be simpler, 1000g = 1kg = 1l?

This is not strictly true. If you follow this logic, then a quart is 2
pounds and since 1kg = 2.2 pounds, a liter is 1.1 quarts and it is not.

The truth is:

1 liter = 1.056718 quarts

The error comes from the assumption that the density of water doesn't
vary with temperature.

1kg = 1l only at 3.98C

3.98C is the triple point of water, a unique temperature.

at 20C 1kg = 1.001732 liters

at 3.98C 1 qt of water weighs 2.0867 pounds

at 20C 1 qt of water weighs 2.0825 pounds

Prior to boiling (212F) 1 qt of water weighs 2.0001 pounds.
--
Pardon my spam deterrent; send email to
18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6
Cheers, Steve Henning in Reading, PA USA