Surface roughness can be measured as either an arithmetic average (AA) or a root-mean-square (RMS) average.Which value is almost always greater for most surfaces:
A)arithmetic average
B)root-mean-square average

Question

Quizplus · Accepted Answer

The root-mean-square (RMS) average is almost always greater than the arithmetic average (AA) for most surfaces because it squares the surface height deviations before averaging, which emphasizes larger deviations more than the arithmetic method.

Surface Roughness Can Be Measured as Either an Arithmetic Average