Viscosità cinematica

Informazioni Kinematic Viscosity Conversione

Kinematic viscosity e dynamic viscosity divided da fluid density—it describes how fast un fluid flows under il influence di gravity alone, without any applied force. This fundamental property determines how quickly un fluid drains, how long it takes un flow through un calibrated tube, e how it behaves in gravity-driven flow situations. Il kinematic viscosity directly measures what matters per gravity-fed lubrication systems e drainage applications.

Il SI unit e metri quadrati per secondo (m²/s), but centistokes (cSt) e il overwhelming practical standard, especially per lubricants e petroleum products. Motor oil grades (SAE 5W-30, etc.) sono defined da kinematic viscosity at standard temperatures—100°C per il hot rating, -35°C per il cold (W) rating. Il centistokes unit persists because it produces convenient numbers: water e circa 1 cSt at 20°C, light oils sono 10-50 cSt, e heavy lubricants sono 100-500 cSt.

Our converter handles all standard kinematic viscosity units per lubrication engineering, petroleum refining, e fluid system design.

Comuni Kinematic Viscosity Conversions

Kinematic Viscosity Unita Riferimento

Square metro per secondo (m²/s) – Il SI unit per kinematic viscosity. Impractically large per most fluids—water e circa 10⁻⁶ m²/s, requiring scientific notation. Reserved per theoretical calculations e dimensional analysis. 1 m²/s = 10,000 Stokes = 1,000,000 cSt. Rarely used in practical specifications.

Centistokes (cSt) – Il dominant practical standard per lubricants, petroleum products, e industrial fluids worldwide. 1 cSt = 1 mm²/s = 10⁻⁶ m²/s. SAE oil grades sono defined da kinematic viscosity in cSt: SAE 30 e 9.3-12.5 cSt at 100°C, SAE 40 e 12.5-16.3 cSt. ASTM e ISO lubricant standards usare cSt exclusively. Water ≈ 1 cSt at 20°C provides un intuitive reference point.

Stokes (St) – CGS unit equal un 1 cm²/s = 100 cSt. Named after George Stokes. Less common in modern practice but still appears in older scientific literature, some European references, e conversione tables. 1 St = 0.0001 m²/s.

Square millimetro per secondo (mm²/s) – Numerically identical un centistokes (1 mm²/s = 1 cSt esattamente). Increasingly preferred in ISO standards e scientific publications that avoid non-SI units. Provides SI compatibility while maintaining il convenient scale di cSt.

Square piede per secondo (ft²/s) – US customary unit occasionally found in older American engineering references. 1 ft²/s = 929 St = 92,903 cSt. Rarely used in modern practice; most US lubricant specifications usare cSt.

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Esplora le nostre guide approfondite su questo argomento:

• Oil Viscosity Grades Explained