Square feet
Physical unit | |
---|---|
Unit name | Square feet |
Unit symbol | |
Physical quantity (s) | surface |
Formula symbol | |
dimension | |
system | Anglo-American system of measurement |
In SI units | |
In CGS units | |
Derived from | foot |
See also: square inches |
The square feet ( square foot , plural square feet ) is a square measure in the Anglo-American system of measurement , which in the US and in the UK is used. It was used as a historical measure in continental Europe until the introduction of the metric system.
A square is defined as a square area having an edge length of 1 foot (corresponding to ^{1} / _{3} Yard , 12 inch (inches) or 0.3048 meters ). This corresponds to approx. 0.09 square meters .
Abbreviations
There is no generally accepted abbreviation for the unit. The following variants are in use:
- square feet, square foot, square ft
- sq feet, sq foot, sq ft, SF
More rarely also:
- feet / -2, foot / -2, ft / -2
- feet ^ 2, foot ^ 2, ft ^ 2
- feet², foot², ft²
In architectural drawings and in real estate trading, a square is also used as a symbol, which is divided by an oblique or vertical line.
conversion
1 square foot corresponds in the Anglo-American system of measurement:
- 144 square inch (square inches)
- 1/9 square yards
- 1/43560 (≈ 0.000 022 956 84 ) acres
- 0.01 square
In the metric or international system of units (SI) :
- 92 903.04 square millimeters
- 929,030 4 square centimeters
- 0.092 903 04 square meters
Historic measure in continental Europe
Before the introduction of the metric system in the course of the 19th century, the square foot (abbr .: Qu.-F. or ◻ ') was also a common measure of area in continental Europe. It differed from country to country, depending on the different foot norms.
For example B .:
- 1 Bavarian Qu.-F. = 0.086475 m²
- 1 Prussian Qu.-F. = 0.098504 m²
- 1 Viennese Qu.-F. = 0.099921 m²
- 1 Parisian Qu.-F. = 0.105521 m²
In Bavaria, but occasionally also in other German regions, a distinction was made between ten and twelve-part square feet. The former was 100 square inches, the latter 144 square inches.
swell
- ↑ Das Hauslexikon , Vol. VI, Breitkopf and Härtel, Leipzig 1837, p. 596.
- ↑ Leopold Einsle: Systematic compilation of the most excellent European measures, weights and coins. Publishing house Jos. Kösel'sche Buchhandlung, Kempten 1846, p. 48.