resistance+from+roughness
41speech — /speech/, n. 1. the faculty or power of speaking; oral communication; ability to express one s thoughts and emotions by speech sounds and gesture: Losing her speech made her feel isolated from humanity. 2. the act of speaking: He expresses… …
42football, gridiron — Game played, predominantly in the U.S. and Canada, on a rectangular field having two goalposts at each end. In the U.S. it is played between two teams of 11 players each. The object is to get an oblong ball, in possession of one side at a time,… …
43gasoline engine — Most widely used form of internal combustion engine, found in most automobiles and many other vehicles. Gasoline engines vary significantly in size, weight per unit of power generated, and arrangement of components. The principal type is the… …
44Erosion — is the carrying away or displacement of solids (sediment, soil, rock and other particles) usually by the agents of currents such as, wind, water, or ice by downward or down slope movement in response to gravity or by living organisms (in the case …
45Quartz crystal microbalance — A quartz crystal microbalance (QCM) measures a mass per unit area by measuring the change in frequency of a quartz crystal resonator. The resonance is disturbed by the addition or removal of a small mass due to oxide growth/decay or film… …
46Reynolds number — In fluid mechanics and heat transfer, the Reynolds number mathrm{Re} is a dimensionless number that gives a measure of the ratio of inertial forces ({old mathrm V} ho) to viscous forces (mu / L) and, consequently, it quantifies the relative… …
47Road transport — (British English) or road transportation (American English) is transport on roads of passengers or goods.A hybrid of road transport and ship transport is the historic horse drawn boat.HistoryThe first forms of road transport were horses, oxen or… …
48Wear — For other uses, see Wear (disambiguation). v · d · e Materials failure modes …
49Electrostatics — For a less technical introduction, see Static electricity. Electromagnetism …
50Skin flora — Depiction of the human body and bacteria that predominate The skin flora are the microorganisms which reside on the skin. Most research has been upon those that reside upon the 2 square metres of human skin. Many of them are bacteria of which… …
