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Cake day: August 17th, 2023

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  • Dagrothus@reddthat.comto196@lemmy.blahaj.zonerule
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    8 months ago

    The confusion stems from the fact that laymen use force and mass interchangeably as they are always on earth and changes in altitude aren’t significant enough to worry about. Standing on a European scale and seeing a measurement in kg isn’t entirely accurate- it’s actually measuring Newtons and implying your mass in kg from that. Standing on an American scale, however, is literally measuring your weight in lbf. However, there is also a confusing unit called lbm or pounds mass which measures the mass of a 1lbf weight object on earth. The average person will never use lbm realistically, but this is technically the unit that converts directly to kg.


  • Dagrothus@reddthat.comto196@lemmy.blahaj.zonerule
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    8 months ago

    No, pounds in the traditional usage refer to lbf, or weight. If you stand on a scale, it measures the force you’re exerting on the scale, which is absolutely distinct from mass because the exact same scale would show a different value on Mt Everest despite you not losing any mass. Every practical use will be measuring lbf. Ie PSI, or pounds per square inch, is clearly referring to force over an area, not mass.

    1 lbm weighs 1 lbf on earth, which implies that accelerating a 1lbm object at a rate of 32.2ft/s2 requires 1lbf.

    Engineers are the few types of people that actually use lbm and slugs. Sensible ones will prefer to just use metric.