Everything about Slug Mass totally explained
The
slug is an
English unit of
mass. It is a mass that accelerates by 1 ft/s² when a force of one
pound-force (lbf) is exerted on it. Therefore a slug has a mass of about 32.17405
pound-mass or 14.5939 kg.
The slug is part of a subset of coherent units known as the gravitational
foot-pound-second system (FPS), one of several such specialized systems of mechanical units developed in the late 19th and the 20th century.
The slug was first used in 1902 by
Arthur Mason Worthington (1852–1916) in
Dynamics of Rotation (
OED), but it didn't see any significant use until decades later. A 1928 textbook says: "No name has yet been given to the unit of mass and, in fact, as we've developed the theory of dynamics no name is necessary. Whenever the mass,
m, appears in our formulae, we substitute the ratio of the convenient force-acceleration pair
(w/g), and measure the mass in lbs. per ft./sec.² or in grams per cm./sec.²".
Another name for this unit in early literature is the geepound.
The unit
slinch (derived from the words slug-inch )
is an inch version of the slug. (1 slinch = 1 lb
f·s²/in = 12 slugs)
The unit
blob (bl) is also an inch version of the slug (1 lb
f·s²/in).
Source:
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