Slug (unit)
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The slug is a derived unit of mass in a weight-based system of measures, most notably within the British Imperial measurement system and the United States customary measures system. Systems of measure either define mass and derive a force unit or define a base force and derive a mass unit[1] (cf. poundal, a derived unit of force in a mass-based system). A slug is defined as a mass that is accelerated by 1 ft/s2 when a net force of one pound (lbf) is exerted on it.[2]
One slug is a mass equal to Template:Convert based on standard gravity, the international foot, and the avoirdupois pound.[3] In other words, at the Earth's surface (in standard gravity), an object with a mass of 1 slug weighs approximately Template:Cvt.[4][5]
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 early 20th century. Geepound was another name for this unit in early literature.[6]
The name "slug" was coined before 1900 by British physicist Arthur Mason Worthington,[7] but it did not see any significant use until decades later.[8] It is derived from the meaning "solid block of metal" (cf. "slug" fake coin or "slug" projectile), not from the slug mollusc.[9] A 1928 textbook says: Template:Quote
The slug is listed in the Regulations under the Weights and Measures (National Standards) Act, 1960. This regulation defines the units of weights and measures, both regular and metric, in Australia.
Related units
The inch version of the slug (equal to 1 lbf⋅s2/in, or 12Template:Nbspslugs) has no official name,[3] but is commonly referred to as a blob,[10] slinch (a portmanteau of the words slug and inch),[11][12] slugette,[13] or snail.[14] It is equivalent to Template:Convert based on standard gravity.[3]
Similar (but long-obsolete) metric units included the glug (980.665 g) in a gravitational system related to the centimetre–gram–second system,[15][16] and the mug, hyl, par, or TME (Template:Langx, 9.80665 kg) in a gravitational system related to the metre–kilogram–second system.[17]
See also
References
External links
- ↑ See Elementary High School physics and chemistry text books/fundamentals.
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c Shigley, Joseph E. and Mischke, Charles R. Mechanical Engineering Design, Sixth ed, pp. 31–33. McGraw Hill, 2001. Template:ISBN.
- ↑ Beckwith, Thomas G., Roy D. Marangoni, et al. Mechanical Measurements, Fifth ed, pp. 34-36. Addison-Wesley Publishing, 1993. Template:ISBN.
- ↑ Shevell, R.S. Fundamentals of Flight, Second ed, p. xix. Prentice-Hall, 1989.
- ↑ gee Template:Webarchive. unit2unit.eu
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Norton, Robert L. Cam Design and Manufacturing Handbook, p. 13. Industrial Press Inc., 2009. Template:ISBN.
- ↑ Slug Template:Webarchive. DiracDelta Science & Engineering Encyclopedia
- ↑ Script error: No such module "citation/CS1".
- ↑ Celmer, Robert. Notes to Accompany Vibrations II. Version 2.2. 2009.
- ↑ Rowlett, Russ. "How Many? A Dictionary of Units of Measurement". unc.edu, September 1, 2004. Retrieved January 26, 2018.
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".