Quote:
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Originally Posted by Tassel
Quote:
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Originally Posted by pghnative
Perhaps the best place to start is to decide how to define a kilogram.
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This comment seems to have been glossed over, probably because it cuts to the heart of the issue and is difficult for "nutant" to respond to.
nutant, what is your proposed definition for the kilogram? |
You may want to re-read this
post July 5 th where I discuss this issue. Pay special attention to the BALANCE between kilograms (equal “weights” both sides) in response to G and 10G example:
Viz.
“Let's say I have a basket of apples which weigh about 2.2 pounds (US) and I put them on a (European) scale in kilograms. What I find is this same basked of apples now weighs 1 kilogram. (I will address the difference between "weight" and "mass" in a minute.) Now put this 1 Kg. on a balance scale where on the other side is a cubic decimeter of water (or one kilogram platinum-irdidum rod) and what do we have? They balance, at least in Earth's gravity they balance. Now suppose that G' were different, let's say tenfold, for Earth. Would the scale still balance? Yes, the cubic decimeter of water would balance against the 1 Kg. apples (and the same for the scale using pounds), but with one difference: if you "weighed" the cubic decimeter of water in G' = 66.7E-11 Nm^2 kg^2, (meaning the Earth's gravitational acceleration was pulling on this cube with ten times the force), would it still be one kilogram compared to G where it was only a tenth, viz. G = 6.67E-11 Nm^2 kg^-2? If you put the basket of apples in 10 G (were it possible) and the cubic decimeter of water in 1 G, which would "weigh" more? Same mass.”
I'll see if I can better explain this above later, when have some free time. The kilogram is always referenced back to one cubic decimeter of water, so the mass is always the same, only how we measure this mass in terms of the G where it is. More later...