Cubic Tonne
There are many entries on the internet for cubic tonne but it is an unofficial unit. Its use should be discouraged because it is not an SI unit and there is uncertainty about its definition. The SI does not use mass-derived units of volume and the SI unit of volume is the cubic metre.
The metric system formerly did use a mass-derived unit of volume, the litre, which was defined as the volume occupied by one kilogram of water. That definition is no longer used and the litre is now defined as one cubic decimetre, although traditionally both synonyms are recognized.
In view of this precedent it is possible that some metric countries may, in the past, have used a cubic tonne but it has never been officially used in the United Kingdom. No definition of the cubic tonne has been found but, if it were defined as the volume occupied by one tonne of water, then it would be almost identical to the cubic metre.
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Famous quotes containing the word cubic:
“Mining today is an affair of mathematics, of finance, of the latest in engineering skill. Cautious men behind polished desks in San Francisco figure out in advance the amount of metal to a cubic yard, the number of yards washed a day, the cost of each operation. They have no need of grubstakes.”
—Merle Colby, U.S. public relief program (1935-1943)