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 to whom he was outwardly subservient, of what he knew. This was a striking example of the code of silent solidarity among senior German Army officers, which was to survive and provide a shield for the resistance groups down to, and in many cases beyond, the crisis of July 1944. On 13 September, the British Prime Minister, Neville Chamberlain, announced that he would visit Germany to meet Hitler and defuse the crisis over Czechoslovakia. This threw the conspirators into uncertainty. When, on 20 September, it appeared that the negotiations had broken down and that Chamberlain would resist Hitler's demands, the