![]() ![]() The term “kinematic” simply means that the measurement is made while fluid is flowing under the force of gravity. The criticality of kinematic viscosity measurement prompted the petroleum industry to develop a precise method, first published in 1937, ASTM D445, Test Method for Kinematic Viscosity of Transparent and Opaque Liquids. Small changes in viscosity can have a dramatic impact on the properties of petroleum fluids. It is an important measurement characteristic in the food, paint, polymer coating and other industries where flow is a critical product or use characteristic. The viscosity of crude oil affects our ability to pump it out of the ground the viscosity and volatility of a fuel affects how easy it is to atomize in the fuel injector the viscosity of a lubricant affects its ability to protect an engine. It is one of the most important properties of a fluid and plays a prominent role in the petroleum industry. Viscosity is a measure of a fluid’s resistance to flow.
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