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 of resistance in the Third Reich. In particular, debate has focused around what to define as "Widerstand" (resistance). Within both the Federal Republic of Germany and the German Democratic Republic, the memory of "Widerstand" was harnessed after 1949 as a way of providing legitimacy to the two rival German states. In East Germany, the focus was unabashedly on celebrating the KPD, which was represented as the only anti-fascist force in Germany; non-Communist resistance was either ignored or slighted. In East Germany, historical work on the subject of "widerstand" was highly politicized and portrayed members of the KPD resistance as heroes.