One pound-foot is approximately 1.355818 newton meters.
The name "pound-foot", intended to minimize confusion with the foot-pound as a unit of work, was apparently first proposed by British physicist Arthur Mason Worthington. However, foot-pound (ft·lb or ft·lbf) is also sometimes used interchangeably with "pound-foot" to express torque.
- Arthur Mason Worthington (1900). Dynamics of rotation : an elementary introduction to rigid dynamics (3rd ed.). Longmans, Green, and Co. p. 9.
- Erjavec, Jack. Manual Transmissions & Transaxles: Classroom manual. p. 38. ISBN 978-1-4354-3933-7.
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