Friction friction and wear in so-called self-lubricating materials. Fluid friction occurs between fluid layers that are moving relative to each other. This internal resistance to flow is named "viscosity". In everyday terms, the viscosity of a fluid is described as its "thickness". Thus, water is "thin", having a lower viscosity, while honey is "thick", having a higher viscosity. The less viscous the fluid, the greater its ease of deformation or movement. All real fluids (except superfluids) offer some resistance to shearing and therefore are viscous. For teaching and explanatory purposes it is helpful to use the concept of an inviscid fluid
Memorial to the German Resistance Memorial to the German Resistance The German Resistance Memorial Center () is a memorial and museum in Berlin, capital of Germany. It was opened in 1980 in part of the Bendlerblock, a complex of offices in Stauffenbergstrasse (formerly Bendlerstrasse), south of the Großer Tiergarten in Tiergarten. It was here that Colonel Claus Schenk Graf von Stauffenberg and other members of the failed 20 July plot that attempted to assassinate Adolf Hitler were executed. Although the memorial is primarily intended to commemorate those members of the German Army who tried to assassinate Hitler in 1944, it is also a memorial to