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
The Resistance to Theory aesthetic approach to literary studies and those who uphold an historical approach both find theory inconvenient and challenging. They are the polemical opponents of theory. As theory is as much a linguistic construct as literature, it falls prey to the same problematics of literary language. De Man states that the resistance to theory may be "a built-in constituent of its discourse." The real debate of literary theory is henceforth "not with its polemical opponents but rather with its own methodological assumptions and possibilities." (p. 358) This is because "the resistance to theory is a resistance to the use of language