Jõunael on tõuke- või tõmbejõud tähisega lbf, rõhutamaks, et tegemist on jõuga, mis on vajalik ühenaelase massi kiirendamiseks Maa standardraskuskiirendusel.
The pound-force is a unit of push or pull force denoted by lbf, emphasizing that it is the force required to accelerate a mass of one pound at Earth's standard acceleration due to gravity.
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