Kilogram, a kilogram is about the size textbook, and if you were measuring an envelope a kilogram would be a good choice.
Mass is a measurement of weight (as opposed to length or volume).
So you would use grams or ounces to calculate the mass of a letter.
Because an envelope is so light, one would use grams (g) to measure the mass of an envelope.
Millimetres. Standard sizes of envelopes are usually given a code: One example is 110mm x 220mm the code being DL (L).
Inches.
Centimetres
meters
Millimeters
Metric tons can't be converted to liters. Metric tons measure mass, while liters measure volume.
Metric tons can't be converted to gallons. Metric tons measure mass, while gallons measure volume.
Metric tons can't be converted to imperial gallons. Metric tons measure mass, while imperial gallons measure volume.
kg for kilogram
The mass would not change, only the numbers describing the amount of mass would change.
GRAMS
Tonnes
Mass is measured using kilograms.
Mass is measured in kilograms.
Mass is measured in kilograms.
The tonne.
Kilograms
Kilograms.
Grams
Probably in grams.
Kilograms
mg.