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1 m3 / cu m = 0.98 tn long wt.
1 tn long wt. = 1.02 m3 / cu m
Definition of cubic meters of water provided by WikiPedia
The cubic meter (in American English) or cubic metre (in British English) is the derived unit of volume. Its symbol is m3 It is the volume of a cube with edges one metre in length. An alternative name, which allowed a different usage with metric prefixes, was the stère, still sometimes used for dry measure (for instance, in reference to wood). Another alternative name, no longer widely used, was the kilolitre.
Definition of U.K. long ton of water provided by WikiPedia
The long ton arises from the traditional British measurement system: A long ton is 20 hundredweight, each of which is 8 stone, which is defined as 14 pounds. Thus a long ton is 20 × 8 × 14 lb = 2,240 lb.