Viscosity

Viscosity is a measure of a fluid's resistance to flow. In aviation, viscosity is an important property of aviation fuels, lubricants, and hydraulic fluids. The viscosity of aviation fuels affects the fuel's ability to flow through fuel lines and nozzles, and to atomize and mix with air in the combustion chamber. The viscosity of lubricants affects their ability to form a protective film on engine parts and to reduce friction and wear. The viscosity of hydraulic fluids affects their ability to transmit power and to lubricate hydraulic system components. Viscosity is typically measured in units of centistokes (cSt) or Saybolt Universal Seconds (SUS).
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