To find the formula in which to check the concentricity and position of something then one must calculate the position. In order to calculate the position, think of it as a function of velocity.

concentration means there is more solute than solvent

A specific calculation is used to calculate concentricity. C = Wmin / Wmax x 100 percent. In this equation, Wmin equals the minimum width and Wmax equals the maximum width.

It does not exist. Concentricity is the variation of the axis of one form to the axis of a datum or reference, it is a control of position. A single tube can not have a concentricity call out. You probably mean cylindricity which is a control on form. A quick google search yielded me such numbers as .015 inches, but it didn't reference the quality of the process. But I'm sure now that you know what your looking for you can find better information.

It is a non-numerical relationships between the parts of a geometric figure. Examples include parallelism, perpendicularity, and concentricity.