12mm
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5X = Y12 ???? If so...., Y12 = 5X Y = 12th root(5X) ===============
(bar) AC
caliper. Micrometer
Nominal diameter of deformed bars are specified by standards.Diameter of deformed bar is controlled from test :1. measure the mass w in kg weighted to a precision 0.5 %2. measure the length L in m to a precision 0.5 %The equivalent diameter is nominal diameter of deformed bars and calcolation is by this formula :Diamater = root square of ( 162.13 w / L )
Density or weight is calculated by mass/volume