Square inch
From HandWiki
| square inch | |
|---|---|
| Unit system | Imperial, United States customary units |
| Unit of | area |
| Symbol | in2, sq in |
| Conversions | |
| 1 in2 in ... | ... is equal to ... |
| Imperial/US |
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| SI units |
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A square inch (plural: square inches) is a unit of area, equal to the area of a square with sides of one inch. The square inch is a common unit of measurement in the United States and the United Kingdom.[1] Pounds per square inch (psi), a unit of pressure, are derived from this unit of area.[2]
Representations
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
1 square international inch is equal to (the overbars indicate repeating decimals):[2][4][5]
- 0.006 94 square feet (1 square foot is equal to 144 square inches)
- 0.000 771 604 9382 square yards (1 square yard is equal to 1,296 square inches)
- 6.4516 square centimetres (1 square centimetre is equal to 0.155 000 310... square inches)
- 0.000 645 16 square metres (1 square metre is equal to 1,550.003 100... square inches)
- π/4 circular inches (1 circular inch is equal to 4/π square inches)
References
- ↑ 1.0 1.1 Cardarelli, François (1997). Scientific Unit Conversion: A Practical Guide to Metrication. M. J. Shields. London: Springer London, Limited. ISBN 978-1-4471-3394-0.
- ↑ 2.0 2.1 2.2 Dresner, 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. http://archive.org/details/isbn_803874960.
- ↑ "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. https://doi.org/10.1093/iat/4.1.263.
- ↑ Template:US Code
- ↑ Blake, Alexander (1991-01-16) (in en). Handbook of Mechanics, Materials, and Structures. John Wiley & Sons. pp. 108–109. ISBN 978-0-471-86239-0. https://books.google.com/books?id=Wp1XC3mN_2IC&dq=United+States+customary+units+handbook&pg=PA118.
Template:United States Customary Units
ja:インチ#平方インチ
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