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Units for other physical quantities are derived from this set as needed. In English Engineering Units, the pound-mass and the pound-force are distinct base units, and Newton's Second Law of Motion takes the form = where is the acceleration in ft/s 2 and g c = 32.174 lb·ft/(lbf·s 2).
pound per foot hour: lb/(ft⋅h) ≡ 1 lb/(ft⋅h) ≈ 4.133 789 × 10 −4 Pa⋅s: pound per foot second: lb/(ft⋅s) ≡ 1 lb/(ft⋅s) ≈ 1.488 164 Pa⋅s: pound-force second per square foot: lbf⋅s/ft 2: ≡ 1 lbf⋅s/ft 2: ≈ 47.880 26 Pa⋅s: pound-force second per square inch: lbf⋅s/in 2: ≡ 1 lbf⋅s/in 2: ≈ 6 894.757 Pa⋅s
ft⋅lb f: inch-pound force: inlbf in⋅lbf 1.0 in⋅lbf (110 mJ) inlb-f in⋅lb f: inch-ounce force: inozf in⋅ozf 1.0 in⋅ozf (7.1 mJ) inoz-f in⋅oz f: horsepower-hour: hph hp⋅h 1.0 hp⋅h (0.75 kWh) British thermal unit: British thermal unit: Btu Btu The International Steam Table British thermal unit is used. For others, see the full list.
An input unit can be converted to any number of output units—the outputs are specified as a "combination" by separating unit codes with a space (" ") or a plus ("+"). Using a space as a separator does not work if any of the unit codes contains a space.
In unit systems where force is a derived unit, like in SI units, g c is equal to 1. In unit systems where force is a primary unit, like in imperial and US customary measurement systems , g c may or may not equal 1 depending on the units used, and value other than 1 may be required to obtain correct results. [ 2 ]
In some contexts, the term "pound" is used almost exclusively to refer to the unit of force and not the unit of mass. In those applications, the preferred unit of mass is the slug, i.e. lbf⋅s 2 /ft. In other contexts, the unit "pound" refers to a unit of mass. The international standard symbol for the pound as a unit of mass is lb. [8]
Systems of measure either define mass and derive a force unit or define a base force and derive a mass unit [1] (cf. poundal, a derived unit of force in a mass-based system). A slug is defined as a mass that is accelerated by 1 ft/s 2 when a net force of one pound (lbf) is exerted on it. [2]
The foot-pound force (symbol: ft⋅lbf, [1] ft⋅lb f, [2] or ft⋅lb [3]) is a unit of work or energy in the engineering and gravitational systems in United States customary and imperial units of measure. It is the energy transferred upon applying a force of one pound-force (lbf) through a linear displacement of one foot.