A Kilogram is a unit of mass in the metric system. It is equivalent
to 1000 grams. The prefix kilo means 1000. Kilogram usually
abbreviated to kg. 1000 kg = 1 tonne.
is usually packed in 1 kilogram bags. The kilogram originated
in the reforms of the French Revolution. Conceptually, it
was to be the mass of a cubic decimeter of water at water's
maximum density. It was originally called a grave, but the
name was changed to kilogram in 1795. In the meantime, a provisional
kilogram was made which was expected to be close enough to
the final value for commercial purposes.
The kilogram is one of SI's seven base units. It is unique
in being the only SI unit still defined by a physical prototype,
and the only one that incorporates one of the decimal multiplier
prefixes in its name.