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Grams
Kilograms are used to express the metric measurement of mass.
1 liter of water has nominally 1 kilogram of mass.1 metric ton = 1,000 kilograms1 cubic meter = 1,000 litersSo 1 cubic meter of water would be 1 metric ton of mass.
Kilogram
Exactly 1 kilogram
I would use a postage scale or a laboratory balance to derive the mass of the card.Once I knew the mass, if I had to write it down, remember it, or tell other peopleabout it, it would undoubtedly be most convenient to express it in grams .
1 liter water weighs 1 kg. The metric system was developed around the weight of water. 1 cubic meter of water is therefore also a mass of water a meter by a meter by a meter and weighs 1 metric ton or 1000 kg.
In the SI - the current metric system - that would be the kilogram. In older metric systems, the gram has been used as the unit of mass.
The mass of what water? The water in one raindrop, in some lake or ocean, in all of the world, in all of the universe?
GRAMS
If it was a cubic meter of water then its mass would be 1000 kg or 1 metric ton.
The is only one Metric System. That is the one you would use. The units you use to measure mass is the kilogram (Kg).