Slug (mass)
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The slug is a unit of mass associated with
Imperial units and United States customary units. It is a mass that accelerates by 1 ft/s2
when a force of one pound-force is exerted on it. One slug has a mass of 32.174049 lbm or 14.593903 kg
based on standard gravity, the international foot, and the avoirdupois pound. At the surface
of the Earth, an object with a mass of 1 slug exerts a force of approximately 32.2 lbF
or 143 N. History
The slug is part of a subset of units known as the gravitational FPS system, one of several
such specialized systems of mechanical units developed in the late 19th and the 20th century.
Geepound was another name for this unit in early literature.
The name “slug” was coined before 1900 by British physicist Arthur Mason Worthington,
but it did not 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 have 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, and measure the mass in lbs. per ft./sec.2 or in grams per cm./sec.2. The slug is listed in the “Regulations under
the Weights and Measures Act, 1960”. This regulation defines the units of weights and
measures, both regular and metric, in Australia. Similar units
The blob is the inch version of the slug or equivalent to 175.126 kg. This unit is also
called slinch. Slang terms include slugette, and a snail.
Metric units include the “glug” in the centimetre-gram-second system, and the “mug”, “par”, or “MTE” in
the metre-kilogram-second system. References External links
“What is a Slug?” on phy-astr.gsu.edu

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