Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A unit of force equal to the weight of one pound-mass in a gravitational field of one gee, about 4.44822 newtons.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A unit of
force equal to a mass of oneavoirdupois pound times a standard acceleration of gravity, equal to about 4.44822newtons . Symbollbf or lbf.
Etymologies
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Examples
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On Monday, not only did I lecture on the difference between weight and mass, but I did the whole spiel on the relation between pound-force (lbf), pound-mass (lbm), and slug (this is an engineering class, after all).
Wired Campus 2010
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Yes, pound-force (the standard pound that your bathroom scale measures) is a force unit because gravity has been taken into account.
Wired Campus 2010
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On Monday, not only did I lecture on the difference between weight and mass, but I did the whole spiel on the relation between pound-force (lbf), pound-mass (lbm), and slug (this is an engineering class, after all).
Wired Campus 2010
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The simulator is capable of attaining pressures of 30,000 psig (pound-force per square inch gauge) at a rated temperature of 500 degrees Farenheit.
National Business News - Local Business News | bizjournals 2010
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So under common conditions, a pound-mass weighs a pound-force, but when one is out of earth's gravity that equivalence fails.
Wired Campus 2010
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On Monday, not only did I lecture on the difference between weight and mass, but I did the whole spiel on the relation between pound-force (lbf), pound-mass (lbm), and slug (this is an engineering class, after all).
Wired Campus 2010
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The slug is the mass that gives rise to a pound-force under an acceleration of 1 ft/s/s.
Wired Campus 2010
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During the tests at NASA's Glenn Research Center in Cleveland, Ohio, a 25 pound-force thruster testbed successfully demonstrated cooling with gaseous methane and gaseous oxygen, as well as rapid start and stop at simulated altitude conditions.
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During the tests at NASA's Glenn Research Center in Cleveland, Ohio, a 25 pound-force thruster testbed successfully demonstrated cooling with gaseous methane and gaseous oxygen, as well as rapid start and stop at simulated altitude conditions.
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The company's TR408 second-generation, oxygen-methane 100 pound-force reaction control engine (RCE) was designed for the Propulsion and Cryogenics Advanced Development Project within NASA's Exploration Technology Development Program, and features robust operation over widely variable propellant conditions.
News 2008
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