Dynamic viscosity measures a fluid’s resistance to deformation by shear or tensile stress, usually in centipoise (cP) or millipascal-second (mPa·s). It describes the internal friction in a fluid layer between moving plates, where higher friction requires more force to maintain movement. Dynamic viscosity varies with temperature, so measurements must include the temperature. Tools like the
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Viscosity measures a fluid’s resistance to flow, reflecting its internal friction. High viscosity means the oil is “thicker” or “heavier,” while low viscosity means it’s “thinner” or “lighter.” For example, honey is thicker (higher viscosity) than water. Viscosity inversely relates to fluidity and changes with temperature. Hotter oil becomes thinner, reducing engine protection, while colder