mega

Ton (ton, tonne, symbol:) t) is a credit of the mass. In addition, there is the ton used for quantity of various physics except the mass.
It is a unit of yard pound method originally. It has begun to be used in the latter half in the 15th century.

Besides, tonne of the OFr is the etymology, and, as for the name of the ton, as for it, "a barrel" means tunne of the Old English. There was it for 1t in about 2,100 weight lb (pound) of the water which was in the barrel containing 252 wine gallon (0.954m3) at first.

In the country using metric system including Japan widely, it points at (metric ton) that it was defined kilogram (kg) as the used ton by a standard for a unit of the mass now. One is defined if equal to 1,000kg (one mega gram). Because gram ton, metric system are French origin because is ton based on a gram, I say the French tonnage.

The history of dates back until 1879. When I used a base unit (a kilogram is accepted as a base unit of the metric system formally after 1901) of the mass of the metric system of the gram and displayed big mass after 18 end of the century metric system establishment, there was not a method to transcribe kilogram size more than it because there was only a limited prefix to millimeters (m) which expressed a one-1000th from kilometer (k) which expressed 1,000 times in those days. In addition, I adopted use of "t" as a sign to express ton as the thing which expressed mass 1,000kg in international weights and measures committee at the time of 1879 again because I was easy to invite confusion with a prefix with a kilometer kilogram in a meaning of 1,000 times of the kilogram double. was accepted for a unit of the mass in the metric system formally by this.
is an SI combination credit by the present (the unit that it is used together with SI, but do not belong to SI). On the other hand, a mega gram (Mg) is born for a unit to express 1,000 times of the kilogram because I become it in 1960 when international unit system (SI) was born aiming at the unit unification of the various places of the metric system, and a big prefix called mega (M) expressing 1,000,000 times was added. Mega gram (Mg) and (t) are credits to express the same mass and recommend what I give priority to the mega gram of an SI unit with prefix in the international unit system and use, but I am wide, and I am recognized and reach it today because recognized combination under the present conditions has been used for a long time historically.

Because it is not allowed to keep a prefix in the SI combination unit, ton cannot be originally accompanied. However, that I can hit a prefix to ton in a specific field giving as follows and express the size is performed as custom.

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