斯勒格(slug)是英制單位中的一種質量單位。若1磅力lbF)的力作用在某物體上,此物體獲得1 英尺/2(1 ft/s2)的加速度,則此物體的質量是1斯勒格。提出這一度量單位的意義是,使得牛頓第二定律F=ma採用英制的英尺、磅的情況下,保持量綱係數為1。

在標準重力場並採用國際英尺及常衡磅制的前提下(重力加速度 g = 9.80665 m/s2 = 32.174 ft/s2英尺換算為1 ft = 0.3048 m,換算為1 lbs = 0.4536 kg),則1 slug = 14.593903 kg。

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