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Hatzegopteryx (mander.xyz)
submitted 2 years ago by to c/science_memes@mander.xyz
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[–] 1 point 2 years ago* (1 child)

Could you provide any source that states that a pound is a unit of force? Because the American National Standard Institute (here), aswell as Wikipedia and numerous other sources claim its a unit of mass.

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  • [–] 1 point 2 years ago (2 children)

    The article you linked to does not mention at any point that LBS is a mass, or at all uses the word mass at any point throughout. In fact, it breifly at the end mentions "1 lb=0.45359237 kilogram" as well as "1 Newton=0.224809 pound force" which could indicate a difference between LBF and LBM distinctions.

    It's commonly understood that you will weigh a different amount of lbs on the moon than on earth. Because it isn't a mass. It's a force of gravity.

    There is also evidence in the form of lbs/in^2 being a common measurement, which would be completely nonsense in the context of mass.

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  • [–] 1 point 2 years ago (1 child)

    Alright, lets look at the US Customary Units and their definitions. Here is the section called "Mass and Weight". As you can see, everything is defined in metric units of mass. You won't find even pound-force to be part of the Customary units. I couldn't find any source saying that pound (not "pound-force") is a unit of force. However, there was an agreement (I think in 1955) to define the pound in kg.

    it breifly at the end mentions "1 lb=0.45359237 kilogram" as well as "1 Newton=0.224809 pound force"

    That basically implies that lb (pound, imperial unit) is a unit of mass and "pound-force" (non-imperial unit, part of the British Engineering Units) is a unit of force. Thus, pound (on its own) is a unit of mass, right?

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