Kilograms . It is still fairly common for Brits to express body weight in stone. A stone in this sense is 14 pounds or a little less than 7 kilograms.
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It depends on what you want to measure. To weigh a human being, a gram is very small and hence inconvenenient unit. Similarly, to weigh an atom/molecule, 'gram' is a big unit and again inconvenient. Therefore, it depends on what you want to weigh.
an average feather weighs about .4677790. --.4677790 what? Needs a unit of measurement!
So far, there is no unit of measurement available to weigh your height. So, I would not use kilometers, at all. Sorry.
No, a pencil is not a unit of measurement.
The smaller the unit the more accurate the measurement will be.