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Reference.org
Short ton
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<p>The short ton (abbreviation: tn or st), also known as the US ton, is a measurement <a href="/facts/Unit_of_measurement/pvTpWbmC">unit</a> equal to 2,000 pounds (907.18 kg). It is commonly used in the <a href="/facts/United_States/P0sCdLe5">United States</a>, where it is known simply as a ton; however, the term is ambiguous, the single word "<a href="/facts/Ton/HDTb0fQo">ton</a>" being variously used for short, <a href="/facts/Long_ton/5ajqnrGq">long</a>, and <a href="/facts/Tonne/gMymLmWv">metric</a> tons. </p><p>The various tons are defined as units of mass. They are sometimes used as units of <a href="/facts/Weight/9NMHCsQd">weight</a>, the <a href="/facts/Force/LNAUWMwK">force</a> exerted by a mass at standard gravity (e.g., short ton-force). One short ton exerts a weight at one <a href="/facts/Standard_gravity/4L5M6jfQ">standard gravity</a> of 2,000 <a href="/facts/Pound_(force)/w62gn6Y0">pound-force (lbf)</a>. </p>