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To help confuse the issue let me point out that according to the NIST's
Special Publication 811 the avoirdupois pound is defined to be *exactly*
0.45359237 kg of *mass*. A 1 pound force (lbf) is the weight of a
1 lb mass in a standard gravitational field. *If* this standard field
strength is taken as the 'official' value of 9.80665 m/s^2 then a 1 lbf
corresponds to *exactly* 4.44482216152605 N of force.