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 German resistance to Nazism German resistance to Nazism (German: "Widerstand gegen den Nationalsozialismus") was the opposition by individuals and groups in Germany to the National Socialist regime between 1933 and 1945. Some of these engaged in active resistance with plans to remove Adolf Hitler from power by assassination and overthrow his regime. The term "German resistance" should not be understood as meaning that there was a united resistance movement in Germany at any time during the Nazi period, analogous to the more coordinated Polish Underground State, Greek Resistance, Yugoslav Partisans, French Resistance, Dutch Resistance, Norwegian resistance movement and Italian Resistance.