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 concept of "Resistenz" leads to a levelling down of fundamental resistance against the system on the one hand and actions criticizing more or less accidental, superficial manifestations on the other: the tyrannicide appears on the same plane as the illegal cattle-slaughterer". Moreover, Hofter noted that the things that Broszat labeled "Resistenz" had no effect within the grander scheme of things on the ability of the Nazi regime to accomplish its objectives within Germany. Another of Broszat's critics, the German historian Klaus-Jürgen Müller argued that the term "Widerstand" should apply only to those having a "will to overcome the system" and