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:
“One of the great natural phenomena is the way in which a tube of toothpaste suddenly empties itself when it hears that you are planning a trip, so that when you come to pack it is just a twisted shell of its former self, with not even a cubic millimeter left to be squeezed out.”
—Robert Benchley (1889–1945)