would you use grams or kilograms to find the mass of a letter?

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Letters are typically very light and hence grams would be a better choice of unit for measuring the mass of a letter. Kilograms may be used for larger/heavier shipments/parcels, but as far as letters are concerned, grams will work just fine.

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In SI units, the base unit for mass is the kilogram.

One kilogram is about 2.2 pounds. One gram is about the mass of a paperclip.

To avoid decimals, you should weigh an envelope in grams. 

(If the mass of the envelope is 7 grams, you could say that it was .007 kilograms, but this seems hard to grasp compared to 7 grams.)

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