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The pound-force is the product of one avoirdupois pound (exactly 0.45359237 kg) and the standard acceleration due to gravity, approximately 32.174049 ft/s 2 (9.80665 m/s 2). [ 5 ] [ 6 ] [ 7 ] The standard values of acceleration of the standard gravitational field ( g n ) and the international avoirdupois pound (lb) result in a pound-force equal ...
Newton-metre: Nm N⋅m 1 Nm lbft; Nm lbfft; Non-SI metric: kilogram-metre: kgm kg·m 9.80665 Imperial & US customary: pound-foot: lbft lb⋅ft Pound-inch (lb.in) is also available 1.3558 Scientific: SI: newton metre: Nm N⋅m 1 Nm lbft; Nm lbfft; Non-SI metric: kilogram-force metre: kgf.m kgf⋅m 9.80665 Imperial & US customary: pound-foot ...
According to Newton's second law, the force F is proportional to the product of mass m and acceleration a: ... If F = 1 lbf, m = 1 lb, and a = 32.174 ft/s 2, ...
≡ N⋅s/m 2, kg/(m⋅s) = 1 Pa⋅s poise : P ≡ 1 barye⋅s = 0.1 Pa⋅s 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 ...
The unit of substance in the FPS system is the pound-mole (lb-mol) = 273.16 × 10 24. Until the SI decided to adopt the gram-mole, the mole was directly derived from the mass unit as (mass unit)/(atomic mass unit). The unit (lbf⋅s 2 /ft)-mol also appears in a former definition of the atmosphere.
historical definitions of the units and their derivatives used in old measurements; e.g., international foot vs. US survey foot. For some purposes, conversions from one system of units to another are needed to be exact, without increasing or decreasing the precision of the expressed quantity.
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The specific weight, also known as the unit weight (symbol γ, the Greek letter gamma), is a volume-specific quantity defined as the weight W divided by the volume V of a material: = / Equivalently, it may also be formulated as the product of density, ρ, and gravity acceleration, g: = Its unit of measurement in the International System of Units (SI) is newton per cubic metre (N/m 3), with ...