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  1. Ton represents ton-force (tonf) when the Ton, m, C unit set is chosen.
  2. A mass of 1.0 tonm, also known as a tonne or metric ton, is given as 1000 kg. In a standard gravity field, the weight of 1.0 tonm produces 1.0 tonf, or a ton-force, given as 9810 Newtons (N).
  3. Because mass must be entered in consistent units (W/g), and not as a force, 1.0 tonf would be entered as W/g = 1 tonf / (9.81 m/s2) = 0.102 tonf * s2/m.

Additional information may be found in the Mass units article and in the CSI Analysis Reference Manual (Joints and Degrees of Freedom > Masses, page 39).