Select the correct statement.
A. The absolute roughness of a pipe de-creases with time.
B. A pipe becomes smooth after using for long time.
C. The friction factor decreases with time.
D. The absolute roughness increases with time.
Answer:D
Select the correct statement.
A. The absolute roughness of a pipe de-creases with time. B. A pipe becomes smooth after using for long time. C. The friction factor decreases with time. D. The absolute roughness increases with time.