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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Boeing and metrcication question
"Ed Huntress" wrote in message news:... "Nick Mueller" wrote in message snip They do have a few "shortcuts" like the liter or bar (= kPa). F.e., the liter is clearly derived from SI (1 dm^3). But nothing like kgm, as kg is already mass. Well, this is a good example of what I've been talking about. The definition of a kilogram is meaningless to non-scientists who have to use the quantity in everyday life. The meaningful quantity is the force that's exerted on a kilogram of mass by gravity. That's the one they can feel, that's the one that's consequential in their lives and work, and that's the one everyone (except scientists) relates to. Thus, the kgm remains the *sensible* unit. The "proper" definition of the kilogram is an abstraction that is essentially meaningless if you don't have a laboratory. Oop, sorry about that. I should have said "kilogram-force" rather than "kgm." -- Ed Huntress |
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