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
German resistance to Nazism Reichsbank, was also in touch with this opposition. The problem these groups faced, however, was what form resistance to Hitler could take in the face of the regime's successive triumphs. They recognised that it was impossible to stage any kind of open political resistance. This was not, as is sometimes stated, because the repressive apparatus of the regime was so all-pervasive that public protest was impossible – as was shown when Catholics protested against the removal of crucifixes from Oldenburg schools in 1936, and the regime backed down. Rather it was because of Hitler's massive support among the German people.