metric system as it is worked on calculation of the distance of earth from the sun. and use's that as a frame of reference. Kevin
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Is as exact as possible
In theory, a measurement that is repeated an infinite number of times, or a very large number of times and then averaged.
What do you mean by "exact measurement"? Do you wish to determine the cylinder's height? Its diameter? Its surface area? Its volume?
It is precisely 0 cm long.
This question makes no sense. An absolute measurement cannot approach anything as it is just one measurement that measures the exact thing that it is measuring.