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Square inch

From Wikipedia, the free encyclopedia
Unit of area
For other uses, seeSquare (disambiguation).
square inch
Unit systemImperial, United States customary units
Unit ofarea
Symbolin2, sq in
Conversions
1 in2in ...... is equal to ...
   Imperial/US   
  • ⁠1/144⁠sq ft
  • ⁠1/1296⁠sq yd
   SI units   
  • 6.4516 cm2
  • 6.4516×10−4 m2

Asquare inch (plural:square inches) is aunit ofarea, equal to the area of asquare with sides of oneinch. The square inch is a common unit of measurement in theUnited States and theUnited Kingdom.[1]Pounds per square inch (psi), a unit of pressure, are derived from this unit of area.[2]

Representations

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The following symbols are used to denote square inches:[1][2][3]

  • square in
  • sq inches, sq inch, sq in
  • inches/-2, inch/-2, in/-2
  • inches^2, inch^2, in^2
  • inches2, inch2, in2 (also denoted by "2)
  • historic usage□″ (number with a square & a double apostrophe, both as an exponent)

Equivalence with other units of area

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1 square international inch is equal to (the overbars indicaterepeating decimals):[2][4][5]

  • 0.006 94 square feet (1 square foot is equal to 144 square inches)
  • 0.000 771 604 9382square yards (1 square yard is equal to 1,296 square inches)
  • 6.4516square centimetres (1 square centimetre is equal to0.155 000 310... square inches)
  • 0.000 645 16square metres (1 square metre is equal to1,550.003 100... square inches)
  • ⁠π/4⁠circular inches (1 circular inch is equal to⁠4/π⁠ square inches)

References

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  1. ^abCardarelli, François (1997).Scientific Unit Conversion: A Practical Guide to Metrication. M. J. Shields. London: Springer London, Limited.ISBN 978-1-4471-3394-0.
  2. ^abcDresner, Stephen (1971).Units of measurement : an encyclopaedic dictionary of units, both scientific and popular, and the quantities they measure. Internet Archive. New York: Hastings House. pp. 91, 248.ISBN 978-0-8038-7496-1.
  3. ^"Conversion Factors for U.S. Customary and SI (Metric) Units".Insecticide and Acaricide Tests.4 (1): 263. 1979-01-01.doi:10.1093/iat/4.1.263.ISSN 0276-3656.
  4. ^15 U.S.C. § 205
  5. ^Blake, Alexander (1991-01-16).Handbook of Mechanics, Materials, and Structures. John Wiley & Sons. pp. 108–109.ISBN 978-0-471-86239-0.
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