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Definition and conversion dynamic to kinematic viscosity Follow us on Twitter Question, remark ? Contact us at [email protected] 1. Dynamic viscosity 2. Kinematic viscosity The viscosity is one of the fundamental properties of fluid used in almost every physical calculations, for example pressure drop calculation. This page is giving the definitions of 2 viscosity, dynamic and kinematic, and how to convert from one viscosity to another. 1. Dynamic viscosity The dynamic viscosity, often represented by the greek letter μ is a measure of the molecular interactions in the fluid. It is expressed in : Pa.s mPa.s cP (centipoise) It is possible to convert from unit to another thanks to : 1 cP = 1 mPa.s = 0.001 Pa.s 2. Kinematic viscosity The kinematic viscosity, often represented by the greek letter ν and used mainly for liquids, is a measure of the viscosity in the particular situation where the fluid is flowing down because of its own weight. Such a flow is actually dependent on the dynamic viscosity of the fluid but also its weight, represented by the density. The conversion from dynamic viscosity to kinematic viscosity can thus be done thanks to the following formula : ν = μ / ρ With : ν = kinematic viscosity (m2/s) μ = dynamic viscosity (Pa.s = kg/m.s) ρ = fluid density (kg/m3) The kinematic viscosity is measured in St (Stokes) cSt m2/s mm2/s The relation in between each unit is : 1 St = 10-4 m2/s 1 cSt = 0.01 St 1 cSt = 1 mm2/s AD AD -->

Frequently asked questions and answers of Viscosity in Engineering Chemistry of Chemistry to enhance your skills, knowledge on the selected topic. We have compiled the best Viscosity Interview question and answer, trivia quiz, mcq questions, viva question, quizzes to prepare. Download Viscosity FAQs in PDF form online for academic course, jobs preparations and for certification exams . Intervew Quizz is an online portal with frequently asked interview, viva and trivia questions and answers on various subjects, topics of kids, school, engineering students, medical aspirants, business management academics and software professionals. Interview Question and Answer of Viscosity Question-1. What is viscosity in fluid mechanics? Answer-1: Viscosity is a measure of a fluid's resistance to flow. Viscosity is a fluid property in which an internal frictional force acts while the fluid is in motion and resist the relative motion. Question-2. How is viscosity typically measured? Answer-2: Viscosity is measured using a viscometer or viscosimeter. Question-3. Define the coefficient of viscosity? Answer-3: It is the tangential force necessary to keep a unit velocity gradient amid two layers each of unit area. Question-4. What are the SI units of viscosity? Answer-4: The SI units of viscosity are Pascal-seconds (Pa·s) or N·s/m2. Question-5. Explain the concept of dynamic viscosity? Answer-5: Dynamic viscosity measures a fluid's internal resistance to shear forces when it flows. It is represented by the symbol η (eta). Question-6. Define fluid? Answer-6: Fluid is a substance which begins to flow when external force is applied on it. Question-7. Give example for fluids? Answer-7: Liquids and gases. Question-8. What is kinematic viscosity, and how is it calculated? Answer-8: Kinematic viscosity is the ratio of dynamic viscosity (η) to the density (ρ) of a fluid. It is calculated using the formula: ? = η / ρ. Question-9. Why is it important to measure viscosity in various applications? Answer-9: Viscosity measurements are crucial for quality control, process optimization, and understanding fluid behavior in industries like manufacturing, pharmaceuticals, and food processing. Question-10. Name a common instrument used to measure viscosity in a laboratory? Answer-10: A common instrument is the Ostwald viscometer. Question-11. What is Stoke's formula? Answer-11: F=6πrηv , Where r = radius, η = fluid velocity, v = sphere velocity Question-12. What is meant by Reynold's number? Answer-12: Rn=(ρVL)/μ , Where ρ = density, V = flow speed, L = linear dimension, μ = dynamic velocity Question-13. Give the Newton's equation for viscous force? Answer-13: F= -ηA(dvx/dz) Question-14. What is the principle behind the capillary tube viscometer? Answer-14: The capillary tube viscometer measures viscosity by recording the time it takes for a liquid to flow through a narrow tube under gravity. Question-15. Define shear rate? Answer-15: Shear rate is the rate at which adjacent layers

Convert between dynamic or absolute viscosity units - Poiseuille, Poise, centPoise and more. Dynamic (Absolute) Viscosity Units Online CalculatorThe calculator below can be used to convert between common absolute or dynamic viscosity units:A Dynamic (Absolute) Viscosity Units Converting TableThe table below can be used to convert between common dynamic or absolute viscosity units.Dynamic (Absolute) Viscosity Units ConverterConvert fromMultiply byConvert toPoiseuille (Pa s)Poise (dyne s/cm2) (g/cm s)centiPoisekg/m hkgf s/m2Poiseuille (Pa s)1101033.63×1030.102Poise (dyne s/cm2) (g/cm s)0.111003600.0102centiPoise0.0010.0113.60.00012kg/m h2.78×10-40.002780.27812.83×10-5kgf s/m29.8198.19.81×1033.53×1041lbf s/inch2(Reyns)6.89×1036.89×1046.89×1062.48×107703lbf s/ft247.94794.79×1041.72×1050.0488lbf h/ft21.72×1051.72×1061.72×1086.21×1081.76×104lb/ft s1.4914.91.49×1035.36×1030.152lb/ft h4.13×10-40.004130.4131.494.22×10-5Dynamic (Absolute) Viscosity Units ConverterConvert fromMultiply byConvert tolbf s/inch2(Reyns)lbf s/ft2lbf h/ft2lb/ft slb/ft hPoiseuille (Pa s)1.45×10-40.02095.8×10-60.6722.42×103Poise (dyne s/cm2 = g/cm s)1.45×10-50.002095.8×10-70.0672242centiPoise1.45×10-72.09×10-55.8×10-90.0006722.42kg/m h4.03×10-85.8×10-61.61×10-90.0001870.672kgf s/m20.0014220.55.69×10-56.592.37×104lbf s/inch211440.044.63×1031.67×107lbf s/ft20.0069410.00027832.21.16×105lbf h/ft2253.6×10311.16×1054.17×108lb/ft s0.0002160.03118.63×10-613.6×103lb/ft h6 10-88.633×10-62.4×10-90.0002781Download and print Dynamic Viscosity Unit Converter chartCommon Dynamic or Absolute Viscosity Units1 Pascal second (Poiseuille) = 1000 Centipoise1 Pascal second (Poiseuille) = 10 Dyne second / centimetre21 Pascal second (Poiseuille) = 0.0102 Gram force seconds / centimetre21 Pascal second (Poiseuille) = 10 Gram / centimetre second1 Pascal second (Poiseuille) = 0.102 Kilogram force seconds / metre21 Pascal second (Poiseuille) = 3600 Kilogram / metre hour1 Pascal second (Poiseuille) = 1 Kilogram / metre second1 Pascal second (Poiseuille) = 107 Micropoise1 Pascal second (Poiseuille) = 1 Newton Second / metre21 Pascal second (Poiseuille) = 10 Poise1 Pascal second (Poiseuille) = 0.0209 Pound force seconds / ft21 Pascal second (Poiseuille) = 0.000145 Pound force seconds / in21 Pascal second (Poiseuille) = 2419.1 Pound / foot hour1 Pascal second (Poiseuille) = 0.672 Pound / foot second1 Pascal second (Poiseuille) = 0.056 Pound / inch second1 Pascal second (Poiseuille) = 0.672 Poundal seconds / ft21 Pascal second (Poiseuille) = 0.000145 Reyn1 Pascal second (Poiseuille) = 0.0209 Slugs / foot second Related Topics Fluid Mechanics The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time. Viscosities Viscosities of products and chemical species at varying conditions. Related Documents Air Viscosity: Dynamic and Kinematic Viscosity at Various Temperatures and Pressures Online calculator, figures and tables with dynamic (absolute) and kinematic viscosity for air at temperatures ranging -100 to 1600°C (-150 to 2900°F) and at pressures ranging 1 to 10 000 bara (14.5 - 145000 psia) - SI and Imperial Units. Ammonia - Properties at Gas-Liquid Equilibrium Conditions Figures and tables showing how the properties of liquid and gaseous ammonia changes along the boiling/condensation curve (temperature and pressure between triple point and critical point conditions). An ammonia phase diagram are