The short ton (abbreviation tn[1]) is a measurement unit equal to 2,000 pounds (907.18 kg).
The various tons are defined as units of mass.
[2] They are sometimes used as units of weight, the force exerted by a mass at standard gravity (e.g., short ton-force).
One short ton exerts a weight at one standard gravity of 2,000 pound-force (lbf).
[citation needed] Both the long and short ton are defined as 20 hundredweights, but a hundredweight is 100 pounds (45.36 kg) in the US system (short or net hundredweight) and 112 pounds (50.80 kg) in the imperial system (long or gross hundredweight).