1) Concrete 1) Roughness 
where Ar is the real (true, actual) surface area and Ag is the geometric surface area. Rugosity calculations are commonly used in materials science to characterize surfaces, amongst others, in marine science to characterize seafloor habitats. A common technique to measure seafloor rugosity is Risk`s chain-and-tape method but with the advent of un....
• (n.) The quality or state of being rugose.
1. The state of being thrown into folds or wrinkles. ... 2. A ruga. ... (05 Mar 2000) ... 
(roo-gos´ĭ-te) the condition of being rugose. a fold, wrinkle, or ruga.
The state of being wrinkled or with ridges.
Ru·gos'i·ty noun [ Latin rugositas : confer French rugosité .] The quality or state of being rugose. 
Type: Term Pronunciation: rū-gos′i-tē Definitions: 1. The state of being thrown into folds or wrinkles. 2. A ruga.
rugosity A wrinkled state or condition.