8/23/2019 Convert Isp Lb To Isp Kg
Mb and Me can be in pounds, kilograms, grams, or tons as long as both use the same unit! Converting ISP into m/sec or feet per second. Unfortunately, most rocket engine performance levels are given in ISP, not in exhaust velocity. You can however convert ISP into exhaust velocity with the following equation: Ev = ISP. 9.81 m/sec 2 (metric). The IPv6 Enabled ISP Logo is to be used by individuals/companies that have assessed that their Internet accessing service comply with the requirements designated by the IPv6 Enabled Steering Group (v6eSG). The IPv6 Enabled ISP Logo can only be used under the following representations made by individuals /companies who desire to use the IPv6.
(Redirected from Pound-force)
The pound of force or pound-force (symbol: lbf[1], sometimes lbf,[2]) is a unit of force or weight used in some systems of measurement including English Engineering units and the British Gravitational System.[3] Pound-force should not be confused with foot-pound, a unit of energy, or pound-foot, a unit of torque, that may be written as 'lbfâ
ft'; nor should these be confused with pound-mass (symbol: lb), often simply called pound, which is a unit of mass.
Definitions[edit]
The pound-force is equal to the gravitational force exerted on a mass of one avoirdupois pound on the surface of Earth. Since the 18th century, the unit has been used in low-precision measurements, for which small changes in Earth's gravity (which varies from place to place by up to half a percent) can safely be neglected.[4]
The 20th century, however, brought the need for a more precise definition. A standardized value for acceleration due to gravity was therefore needed.
Product of avoirdupois pound and standard gravity[edit]
The pound-force is the product of one avoirdupois pound (exactly 0.45359237 kg) and the standard acceleration due to gravity, 9.80665 m/s2 (about 32.174049 ft/s2).[5][6][7]
The standard values of acceleration of the standard gravitational field (gn) and the international avoirdupois pound (lb) result in a pound-force equal to 4.4482216152605 N:[8]
This definition can be rephrased in terms of the slug. A slug has a mass of 32.174049 lb. A pound-force is the amount of force required to accelerate a slug at a rate of 1 ft/s2, so:
Conversion to other units[edit]
Footâpoundâsecond (FPS) systems of units[edit]
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. lbfâ
s2/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.[9]
In the 'engineering' systems (middle column), the weight of the mass unit (pound-mass) on Earth's surface is approximately equal to the force unit (pound-force). This is convenient because one pound mass exerts one pound force due to gravity. Note, however, unlike the other systems the force unit is not equal to the mass unit multiplied by the acceleration unit[12]âthe use of Newton's Second Law, F = m â
a, requires another factor, gc, usually taken to be 32.174049 (lbâ
ft)/(lbfâ
s2).'Absolute' systems are coherent systems of units: by using the slug as the unit of mass, the 'gravitational' FPS system (left column) avoids the need for such a constant. The SI is an 'absolute' metric system with kilogram and meter as base units.
See also[edit]
Notes[edit]
References[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Pound_(force)&oldid=889141089'
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