The cubic foot (symbol ft3orcu ft)[1] is an imperial and US customary (non-metric) unit of volume, used in the United States and the United Kingdom. It is defined as the volume of a cube with sides of one foot (0.3048 m) in length. Its volume is 28.3168 L (about 1⁄35 of a cubic metre).
The IEEE symbol for the cubic foot is ft3.[1] The following abbreviations are used: cubicfeet, cubicfoot, cubicft, cufeet, cufoot, cuft, cu.ft, cuft, cbft, cb.ft, cbft, cbf, feet3, foot3, ft3, feet/-3, foot/-3, ft/-3.[citation needed]
Larger multiples are in common usage in commerce and industry in the United States:
CCF or HCF: Centum (Latin hundred) cubic feet; i.e., 100 ft3
BCF or TMC: Billion or thousand million cubic feet; i.e., 1000000000ft3
TMC is usually used for referring to storage capacity and actual storage volume of storage dams.
TCF: Trillion cubic feet; i.e., 1000000000000ft3
Used in the oil and gas industry.
Cubic foot per second and related flow rates[edit]
The IEEE symbol for the cubic foot per second is ft3/s.[1] The following other abbreviations are also sometimes used:
ft3/sec
cu ft/s
cfs or CFS
cusec
second-feet
The flow or discharge of rivers, i.e., the volume of water passing a location per unit of time, is commonly expressed in units of cubic feet per second or cubic metres per second.
Cusec is a unit of flow rate,[2] used mostly in the United States in the context of water flow, particularly of rivers and canals.
The IEEE symbol for the cubic foot per minute is ft3/min.[1] The following abbreviations are used:
cu ft/min
cufm
cfm or CFM
cfpm or CFPM
Cubic feet per minute is used to measure the amount of air that is being delivered, and is a common metric used for carburettors,[3] pneumatic tools, and air-compressor systems.[4]