There is no largest unit.
-- In the SI (metric) system, there's only one unit of mass. It's called the kilogram,
and people who need to work with larger units just add other prefixes, like milli-,
micro-, nano-, mega, giga-, etc. to indicate larger or smaller multiples of grams,
in factors of 1,000.
-- In the Burmese, Liberian, and US Customary system, there are several different
units of mass. The biggest one I know of is the 'Slug'. That's the amount of mass
that accelerates at the rate of 1 foot/second2 when you push on it with a force of
one pound-force. You can always spot a Slug on Earth, because it weighs 32.2 pounds.
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Kilogram is a unit of mass, not of length.Kilogram is a unit of mass, not of length.Kilogram is a unit of mass, not of length.Kilogram is a unit of mass, not of length.
The atomic mass unit is not a SI unit. An atomic mass unit is equal to 1/12 from the atomic mass of the isotope 12C.
The kg (kilogram) is the unit of mass in SI.The kg (kilogram) is the unit of mass in SI.The kg (kilogram) is the unit of mass in SI.The kg (kilogram) is the unit of mass in SI.
The same unit as you use to measure any mass. The SI unit for mass is the kilogram.
KILOGRAM IS THE BASE UNIT FOR MASS yards are the best unit for math