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It is of not much importance, but calculated as

T.V. = 15 + 148(kinematic viscosity)

It is used for less volatile fractions and important for illuminating oils.

Ring no. is defined for illuminating oils which should be in a range of 60 to 130

Ring no. = (T.V/5)-10(46-API)

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Transport properties of fluids include viscosity, thermal conductivity, and diffusivity. Viscosity is a measure of a fluid's resistance to flow, thermal conductivity relates to the fluid's ability to conduct heat, and diffusivity describes how easily a substance can spread or diffuse within the fluid. These properties are important in various engineering applications, such as in fluid dynamics and heat transfer processes.


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