Cubic feet

Cubic feet is a measure of space based on the length measure of feet .

English cubic feet

Physical unit
Unit name	Cubic feet
Unit symbol	${\displaystyle \mathrm {cft} }$
Physical quantity (s)	volume
Formula symbol	${\displaystyle V}$
dimension	${\displaystyle {\mathsf {L^{3}}}}$
system	Anglo-American system of measurement
In SI units	${\displaystyle \mathrm {1\,cft=0{,}028\,316\,846\,592\;m^{3}} }$
Derived from	foot

The English cubic foot (English cubic foot , abbreviation cft ) is a measure of space that is still often used, especially in shipbuilding, which is based on the English foot (0.3048 m). It is also often used in the former Soviet Union .

One cubic foot equals:

• 1728 cubic inches = 12³ inches³
• 1/27 (≈ 0.037037) cubic yard
• 1728/231 (≈ 7.48052) gallons
• 28.317 liters
• 1 acre-foot = 43,560 cubic foot

If the volume of diving equipment is given in cft, it refers to the total amount of fillable air (operating pressure times cylinder volume). 80 cft at 200 bar operating pressure therefore correspond to approx. 11.3 l actual cylinder volume.

German-speaking area

In German-speaking countries, too, the cubic foot was used to measure the volume of dry goods until the meter convention was introduced in 1875. It was based on a different foot measurement and therefore differs significantly:

• 0.027 m³ in Baden
• 0.024859 m³ in Bavaria
• 0.023237 m³ in Braunschweig
• 0.02353 m³ in Hamburg
• 0.024921 m³ in Hanover
• 0.02364 m³ in Kurhessen
• 0.030915 m³ in Prussia
• 0.022706 m³ in Saxony (1858)
• 0.027374317 m³ in Switzerland
  • 1 cubic foot = 1728 cubic inches with 1728 cubic lines each = 0.027374317 cubic meters
• 0.023517 m³ in Württemberg
• 0.031578 m³ in Austria

and other.

Individual evidence

1. ↑ Georg Thomas Flügel: Course slip continued as a manual for coin, measure, weight and Customs. Editor L. F. Huber Verlag der Jäger'schen Buch-, Papier- und Landkartenhandlung, Frankfurt am Main 1859, p. 268.

Web links

• Comparison of the various cubic foot dimensions