The definition of
Kilogram:
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The kilogram or kilogramme, (symbol: kg) is the SI base unit of mass. A gram is defined as one thousandth of a kilogram. Conversion of units describes equivalent units of mass in other systems.
Since 1889, the SI system defines the unit to be equal to the mass of the international prototype of the kilogram, which is made from an alloy of platinum and iridium of 39 mm height and diameter, and kept at the Bureau International des Poids et Mesures (International Bureau of Weights and Measures).
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The definition of
Mass:
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Mass is a property of physical objects that, roughly speaking, measures the amount of matter they contain. It is a central concept of classical mechanics and related subjects.
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Based on the definitions above, kilograms are a numeric representation of the amount of matter that an object is composed of. 1 kilogram is
defined as the amount of matter that composes a specific platinum and iridium rod.
We could take that rod anywhere in the universe, even in a universe where G varies greatly (which we know isn't the case in our universe). Since the amount of matter in the rod does not change, then
by definition the mass of the rod is still one kilogram.
The amount of matter that makes up an object is a physical property that is measured in kilograms. What 1 kilogram means is not up for debate. It is a
defined value. That definition does not include the value of G. Don't bother: it doesn't include the value of G
not because "we've always assumed constant G", but because
G has no bearing on how much matter an object is composed of.
Kilograms are a measure of mass. Mass is a physical property of an object that represents the amount of matter that makes up the object. The amount of matter in an object does not depend on the value G. Therefore, kilograms, which are the unit we use to represent quantities of matter, would not be different if G were different.
If you want to debate what happens to the unit "kilogram" if G were somehow different, you are not debating anyone in this forum.
You are debating the definition of "kilogram".
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Originally Posted by nutant gene 71
Yes, Tassel, I think you're smart too.
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You launched an ad hominem attack on my intelligence while simultaneously demonstrating that you do not have any kind of intuitive understanding about how orbits are determined. With that, and your history of intellectual dishonesty in mind, I couldn't possibly care any less if you think I'm smart or not.