The Area of Contact between Stationary and between Moving Surfaces

摘要: When two plane surfaces are placed together the area of intimate contact must be very much less than apparent area. Even if carefully polished and made as flat possible, hills valleys will still present on surface. The upper surface supported these irregularities, large areas separated by a distance which is great compared with dimensions molecule. We do not know about size irregularities nor degree flatness surfaces. Optical methods cannot reveal smaller half wave-length light. scattering protons (Knauer Stern 1929) or diffraction electrons (Thomson 1934; Finch, Quarrell Wilman 1935) can give information structure small portion surface, but would presence isolated peaks show how over Since it difficult, even most refined technique, to prepare within one thousand angstroms, we may expect that contact, is, range molecular attraction, will, for surfaces, small. Some knowledge real essential any complete understanding mechanism friction, this paper describes an attem pt estimate both stationary moving