Ang relative viscosity at absolute viscosity ay dalawang konsepto na naglalarawan ng lagkit ng isang likido, at may ilang pagkakaiba sa pagitan nila.

Relatibong lagkit:

Relative viscosity is the viscosity of a fluid compared to a reference fluid (karaniwan ay isang solvent) at a given temperature. It is determined by measuring the flow properties of the fluid and the reference fluid. Relative viscosity is a dimensionless value that indicates the degree to which the viscosity of the fluid increases relative to the reference fluid. Relative viscosity can be calculated by measuring the movement time or flow rate of the fluid.

Pagkakaiba sa pagitan ng relative viscosity at absolute viscosity

Ganap na lagkit:

Ang ganap na lagkit ay tumutukoy sa aktwal na lagkit ng isang likido, kilala rin bilang dynamic viscosity o dynamic viscosity. Ito ay natutukoy sa pamamagitan ng pagsukat ng lakas ng tunog (daloy ng rate) of the fluid passed through per unit area per unit time. Ang ganap na lagkit ay isang pisikal na dami na may mga yunit, karaniwang ginagamit sa PASCAL seconds (Mga Pa·) or millikpa · second (mPa·s).

Absolute viscosity is an inherent property of fluid and can be directly used in the calculation and analysis of fluid mechanics. Relative viscosity is a comparative value with respect to a reference fluid and is often used to measure liquid mixtures and compare liquid properties.

The relationship between relative viscosity and absolute viscosity can be expressed by a constant called the proportionality constant or the conversion factor of relative viscosity to absolute viscosity. Ang conversion factor na ito ay depende sa reference fluid at temperatura kondisyon na ginamit. To sum up, the relative viscosity is the comparison of the viscosity of the fluid with respect to the reference fluid, while the absolute viscosity is the actual viscosity of the fluid.