tests performed on drilling fluid used in oil or gas well development. The viscosity of crude oils can be measured using a standard method (ASTM D2983). The viscosity of a fluid is a measure of its resistance to deformation at a given rate. However, different reference temperatures, such as 40☌ (104 ☏), 50 ☌ (122 ☏), and 60 ☌(140 ☏), are also used to report kinematic viscosities of petroleum fractions. Values of kinematic viscosity for pure liquid hydrocarbons are usually measured and reported at two reference temperatures, 38☌ (100☏) and 99☌ (210☏) in cSt. Kinematic viscosity is expressed in units of centistokes (cSt), Saybolt Universal seconds (SUS), and Saybolt Furol seconds (SFS). Viscosity of liquids is usually measured in terms of kinematic viscosity, which is defined as the ratio of absolute (dynamic) viscosity to absolute density (ν = μ/ρ). At Wearcheck, every sample gets four basic tests: ICP spectroscopy, particle quantification, viscosity at 40☌ and water screening. Among petroleum products, viscosity constitutes a critically important characteristic of lubricating engine oils. Interestingly, the viscosity of liquid decreases with increasing temperature, while viscosity of gases increases with increasing temperature. Power requirement to transport (e.g., to pump) a fluid depends strongly on the fluid’s viscosity. Newton’s Law of Viscosity provides a physical definition of viscosity. A high-viscosity fluid has a low tendency to flow, whereas low-viscosity fluids flow easily. Viscosity, commonly depicted by the symbol μ, is a physical property of a fluid that describes its tendency/resistance to flow.
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