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
Resistance to diversity efforts in organizations research found White people experience heightened threat in response to pro-diversity messages, and that this threat manifests in physiological (cardiovascular reactions), psychological (self-disclosed concerns), and behavioral (making poorer impressions) domains. Researchers have observed some men will resist gender diversity under certain conditions; the researchers presented men in the fields of science, technology, engineering, and mathematics (STEM) with information that diversity initiatives will effectively increase female representation, which led to resistance among men who believed there is legitimacy to men best-representing STEM (i.e. prototypicality legitimacy) and those who also had concerns about losing the ability to best represent STEM (prototypicality threat).