Surface roughness can be measured as either an arithmetic average (AA) or a root-mean-square (RMS) average. Which value is almos
t always greater for most surfaces?
1 answer:
Answer:
Root-mean-square (RMS)
Step-by-step explanation:
Arithmetic average is the average of all the values of the surface peaks and valleys.

Root mean square is the root of the sum of the squares of each of the values of the surface peaks and valleys divided by the number of values

where n = the number of values
So, the root-mean-square RMS is always greater than the arithmetic average (AA).
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