I would use a postal scale to weigh the letter. Once I knew the weight,
I could express it in any unit of force, but 'grams' would probably result
in the most convenient number.
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Grams and kilograms are measurement of weight. For a letter you would use grams. For a package you would use kilograms as it weight is more.
it is weighed in grams
As far as I can tell there is no such thing as a canalop! So it does not matter whether you use grams or kilograms - the measure will be zero in either case.
Yes bcause one kilogram is 100 grams and there is at least 5 kilograms and that alone would be 5oo grams.
1 kilogram = 1,000 grams2 kilograms = 2,000 grams..7 kilograms = 7,000 grams..70 kilograms = 70,000 grams..700 kilograms = 700,000 grams..700 thousand kilograms = 700,000 thousand grams = 700 million grams