Surface roughness has a huge impact on many important phenomena. The mostimportant property of rough surfaces is the surface roughness power spectrumC(q). We present surface roughness power spectra of many surfaces of practicalimportance, obtained from the surface height profile measured using opticalmethods and the Atomic Force Microscope. We show how the power spectrumdetermines the contact area between two solids. We also present applications tosealing, rubber friction and adhesion for rough surfaces, where the powerspectrum enters as an important input.
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