absolute viscosity formula

Kinematic viscosity can be obtained by dividing the absolute viscosity of a fluid with the fluid mass density. Absolute viscosity is a parameter for measuring the internal resistance in the fluid. Multigrade oils must fulfill two viscosity specifications, their viscosity grade consists of two numbers, e.g. Viscosity types. Gas Viscosity Calculator - LMNO Eng Viscosity μ = absolute viscosity. Measuring the Different Types of Viscosity with Viscometers Viscosity is a measure of a fluid’s resistance to flow. Kinematic Viscosity Common Pump Formula Product Viscosity where: 2 = Kinematic viscosity (mm /s) = Absolute viscosity (mPas) = fluid density (kg/m3) Or where: = Kinematic viscosity (cSt) = Absolute viscosity (cP) SG = specific gravity Or where: 1 poise = 100 cP 1 stoke = 100 cSt Flow Velocity V = fluid velocity (m/s) where: Q = capacity (m3/s) Viscosity depends strongly on temperature. Water Viscosity Calculator The difference between VG10 and VG30. We have: ν: Kinematic viscosity. Viscosity Formula Definition and Units in Chemistry ... Systematic Errors in Absolute Measurements Nearly all … Nitrogen-viscosity Baronetal. Portal to dynamic viscosity or absolute viscosity conversion tables. Another method for calculating the viscosity of air at a specified temperature and pressure will also be presented and discussed. The formula of viscosity is: {eq}\eta = (F*d)/ (A*v) {/eq} There are two types of viscosities, which are: Dynamic viscosities, which measure the … The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow. Dynamic viscosity (sometimes referred to as Absolute viscosity) is obtained by dividing the Shear stress by the rate of shear strain. The constant (K) of the instrument is determined using a liquid of known viscosity or by reference to tables supplied by the instrument manufacturer. In liquids it usually decreases with increasing temperature, whereas, in most gases, viscosity increases with increasing temperature. Absolute/dynamic viscosity of Newtonian liquid-Absolute Viscosity: If a tangential force equal to 1 dyne is acting on planes of unit area separated by a unit distance of liquid produces tangential velocity of one unit, then the internal friction acting at that time is called absolute or dynamic viscosity. Common Pump Formula Product Viscosity where: 2 = Kinematic viscosity (mm /s) = Absolute viscosity (mPas) = fluid density (kg/m3) Or where: = Kinematic viscosity (cSt) = Absolute viscosity (cP) SG = specific gravity Or where: 1 poise = 100 cP 1 stoke = 100 cSt Flow Velocity V = fluid velocity (m/s) where: Q = capacity (m3/s) Therefore, proper characterization of viscosity must be carried out at a shear rate that is relevant to the specific process. The dif- The units of dynamic viscosity are: Force / area x time The Pascal unit (Pa) is used to describe pressure or stress = force per area This unit can be combined with time (sec) to define dynamic viscosity. Thus, a fluid with a large viscosity has a low fluidity. Another method for calculating the viscosity of air at a specified temperature and pressure will also be presented and discussed. By dividing the absolute or dynamic viscosity of a fluid with the fluid mass density, kinematic viscosity can be obtained, and Centipoise (cP) is the unit of measure for dynamic viscosity. It refers to the fluid’s internal resistance to flow when force is applied. For example, the viscosity of water at 60 degrees Fahrenheit is approximately 1.02 centipoise where as the viscosity of a 50% propylene glycol solution at the same temperature is 8.13 centipoise. The absolute viscosity can be calculated as μ = 1.113 (kg/m3) 16.97 10-6 (m2/s) = 1.88 10-5 (kg/ (m s), N s/m2) Viscosity of some Common Liquids Viscosity Converting Chart Kinematic viscosity can be converted from SSU to Centistokes with νCentistokes = 0.226 νSSU - 195 / νSSU (4) where νSSU < 100 νCentistokes = 0.220 νSSU - 135 / νSSU where Since, the formula for coefficient of viscosity is given by, η = F . The inverse of viscosity is called fluidity [ McCain, 1990 ]. , η 1, η 2 represents the absolute viscosity of PEG 200 and 1,2-PDA. It measures the tangential force per unit area required to move one horizontal plane with respect to an other plane. Can be calculate the Relative Viscosity by the relationships: Liquid 1: ethanol (density of ethanol = 0.789 g/cm3) This formula, often called Sutherland's law, is based on kinetic theory of ideal gases and … The viscosity of a fluid is a measure of its resistance to deformation at a given rate. Dynamic (absolute) viscosity: Dynamic viscosity is also known as absolute viscosity and most often relates to non-Newtonian fluids. It is the ratio of the dynamic viscosity to its density, a force independent quantity. The standard unit used to measure viscosity is the centistoke (cSt). According to the Automotive and Industrial Lubricants Glossary of Terms: Viscosity is ordinarily expressed in terms of the time required for a standard quantity of the fluid at a certain temperature to flow... Power Law is another approximation to calculate viscosity and is given by The dynamic viscosity coefficient divided by the density is called the kinematic viscosity and given the Greek symbol nu. Viscosity is measured using a viscometer. The viscosity of a liquid as a function of temperature can be approximated with the Andrade correlation. t Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress. Also known as the coefficient of kinematic viscosity. In general, gas viscosity is less than liquid viscosity. Fluid Viscosity. viscosity, resistance of a fluid (liquid or gas) to a change in shape, or movement of neighbouring portions relative to one another. Therefore, the viscosity of gases may be estimated with an accuracy sufficient for most engineering calculations, e.g. Viscosity Types Rotating viscometers can be divided in 2 groups, namely absolute and relative viscometers. Viscosity denotes opposition to flow. It will be discussed and used in example calculations. Calculate the viscosity at a given temperature, when the viscosity is known at two temperatures. For liquids, viscosity corresponds to the informal notion of "thickness". ρ: fluid density. Another method for calculating the viscosity of air at a specified temperature and pressure will also be presented and discussed. The kinematic viscosity is an atmospheric variable defined as the ratio between the dynamic viscosity μ and the density ρ of the fluid, i.e. The viscosity acts as an important fluid property during the analysis of liquid behavior and fluid motion near solid boundaries. Absolute viscosity N s per square m Kinematic viscosity, The density is: i.e. There are several methods in use. Viscosity models for mixtures. viscosity) or non-Newtonian liquids (shear dependent viscosity or apparent viscosity). the quotient of dynamic viscosity and oil density, is a function of the temperature and is a major factor determining the level of noise generated by transmissions. This is known as Dynamic Viscosity. This table presents the absolute viscosity of some common fluids and his evolution against the temperature. ρ: fluid density (1951)[38] 25 200–2500 0.1 DiluteGas 4.60 Boonetal. μ = absolute viscosity. absolute (dynamic) viscosity of a fluid is the poise, which is equal to 100 centipoise. What is the pressure necessary to move a plane of fluid with a shear rate of 0.35 s-1 and a dynamic viscosity of 0.018 Pa*s? Absolute viscosity is one of the most important parameters in the development and modeling of applications that involve fluid flow. This water viscosity calculator will help you determine the viscosity of water at room temperature, or at any temperature, even those above 300 °C!In this calculator, you will learn what the absolute viscosity of water is (commonly known as the dynamic viscosity of water) and learn how to convert it to kinematic viscosity. Dynamic (absolute) viscosity: Dynamic viscosity is also known as absolute viscosity and most often relates to non-Newtonian fluids. In liquids it usually decreases with increasing temperature, whereas, in most gases, viscosity increases with increasing temperature. A water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds. s and the kinematic viscosity 15.7 cSt. The quantity defined above is sometimes called dynamic viscosity, absolute viscosity, or simple viscosity to distinguish it from the other quantity, but is usually just called viscosity. The viscosity of a fluid is a measure of its resistance to deformation at a given rate. Pick a table with which to convert poises to any other unit of measurement of dynamic viscosity. Water is a chemical compound with the chemical formula H2O. viscosity known as dynamic (or absolute) and kinematic viscosity. Several engineering units are used to express viscosity, but the most common by far are centistoke (cSt) for kinematic viscosity and the centipoise (cP) for dynamic (absolute) viscosity. Calculation Absolute viscosity of the sample is calculated and reported to the three significant figures. Following equation is used for calculating absolute viscosity: K = selected calibration factor; in poise/second t = time of flow; in seconds absolute viscosity is obtained in Poise Dynamic viscosity = It is a force required to overcome the internal friction of any fluid. The other quantity called kinematic viscosity (represented by the Greek letter ν "nu") is the ratio of the viscosity of a fluid to its density. The viscosity index can be calculated using the following formula: [citation needed] where U is the oil's kinematic viscosity at 40 °C (104 °F), and L and H are values based on the oil's kinematic viscosity at 100 °C (212 °F). 8) where b and S are constants and T is temperature expressed in Eq. 2. There are several formulas and equations to calculate viscosity, the most common of which is Viscosity = (2 x (ball density – liquid density) x g x a^2) ÷ (9 x v), where g = acceleration due to gravity = 9.8 m/s^2, a = radius of ball bearing, and v = velocity of ball bearing through liquid. Kinematic viscosity = Dynamic viscosity / Fluid mass density. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. In this paper an attempt has been made to find temperature dependent dynamic (or absolute) viscosity of some common domestic usable Oil namely Soya bean Oil, Coconut oil, Kerosene oil and 2T Oil. In absolute viscometers the flow in the measuring geometry is well defined. Pressure Gauge indicates the difference between the fluid pressure and the atmospheric pressure (P atm). Dynamic (or Absolute) Viscosity: The dynamic viscosity(η) of a fluid is a measure of the resistance it offers to relative shearing motion. Kinematic viscosity is dynamic viscosity divided by density (Formula F7. The measurements result in absolute viscosity values, which This formula, often called Sutherland's law, is based on kinetic theory of ideal gases and an idealized intermolecular-force potential. Formula: The kinematic viscosity = Dynamic viscosity / Fluid mass density. Here we are discussing major Difference Between Kinematic And Dynamic Viscosity. Absolute Viscosity of the sample = Average value of 1 and 2. By using the normalized pure water viscosity data ( IAPWS-2008) the parameters a and b of Eq. Description. The unit employed for measuring the dynamic viscosity of a fluid is Pa.s (where ‘Pa’ stands for Pascal and ‘s’ stands for seconds). The greater the resistance to flow, the higher the viscosity, so for example, syrup has a … Kinematic viscosity can be obtained by dividing the absolute viscosity of a fluid with the fluid mass density. L T − 1. Vector quantities (F, g, v) are written in a bold, serif font — including vector quantities written with Greek symbols (α, τ, ω).Scalar quantities (m, K, t) and scalar … cSt is a metric unit used in a formula th at otherwise has English units. The physical unit for dynamic viscosity in the centimetre gram second system of units (cgs) is … Measured values span several orders of magnitude. Calculate the dynamic viscosity (η) in pascal seconds (Pa s) from the expression η=KL/w, Where, L = the angular momentum in Newton meters, w = the angular speed in radians per second. Fluid Viscosity. ViscosiTy of gases marcia l. huber and allan h. harvey The following table gives the viscosity of some common gases as a function of temperature . So, the SI unit of kinematic viscosity = m 2 s-1 . We have: ν: Kinematic viscosity. Dynamic viscosity of gases is primarily a function of temperature. This is a derivative property of fluid velocity in a direction perpendicular to the plates. For air and . If a sphere is dropped into a fluid, the viscosity can be determined using the following formula: η = 2ga2(Δρ) 9v η = 2 g a 2 ( ∆ ρ) 9 v Where ∆ ρ is the density difference between fluid and sphere tested, a is the radius of the sphere, g is the acceleration due to gravity and v is the velocity of the sphere. Dynamic Viscosity Formula for the fluid will define its internal resistance to flow due to some shearing force. Consider, the viscosity of that fluid is 0.45 Ns/m 2 and 950 kg/m 3 is the value of relative density. The gas viscosity will increase with temperature. Water is a liquid at standard ambient temperature and pressure, but it often co-exists on Earth with its solid state, ice, and gaseous state, steam (water vapor). Pump system calculations, metric units. (1959)[36] 40 325–408 0.68–55.2 0.20–14.5 1.38 Bonillaetal. Unless otherwise noted, the viscosity values refer to a pressure of 100 kPa (1 bar) . Absolute viscosity - coefficient of absolute viscosity - is a measure of internal resistance. More viscosity conversions are provided later in this text. Absolute Viscosity is the force needed by a fluid to overcome its own internal molecular friction so that it can flow. This tangential force acts on a unit area which is needed to make the liquid move in a horizontal plane with respect to another plane with a unit velocity while the liquid molecules maintain a unit distance apart. … Absolute or dynamic viscosity is used to calculate Reynold's Number to determine if a fluid flow is laminar, transient or turbulent.. Tabulated values and viscosity units conversion are given below the … Common examples include flowmeters, thermistors, and thermal conductivity detectors. Absolute viscosity is the force that must be applied per unit area to move a sheet of liquid horizontally relative to another sheet of liquid at one unit of speed. ρ = 3/ (0.98) ρ = 3.0612 kg/m 3. Therefore, this type of viscosity measurement requires an external force in order to be measured. The units of nu are length^2/sec. (3 marks) Ans. η: Dynamic viscosity Power is given by the combination of four items: the specific gravity SG, the total head , the flow rate Q and the efficiency of the pump eta .The specific gravity SG is the ratio of the fluid's density to that of water at standard conditions, for water the value of SG equals 1. According to Newton, the viscosity formula is, F = μ A u y. Fluids resist the relative motion of immersed objects through them as well as to the motion of layers with differing velocities within them. ent on the viscosity of a fluid or the thermal conductivity, which is proportional to the product of the viscosity and the heat capacity. For example, honey has a higher viscosity than water. Dynamic viscosity (absolute viscosity) kinematic viscosity; It describes the internal friction of a moving fluid. Water is a liquid at standard ambient temperature and pressure, but it often co-exists on Earth with its solid state, ice, and gaseous state, steam (water vapor). The dynamic viscosity has the dimension ML-1 T-1 and the unit of kg/m.s (or, N.s/m 2 or Pa.s). The SI units of absolute viscosity is Nsec/(m)2. Poise is also the unit of absolute viscosity and. ! N*sec/(m)2=10 Poise. Unless otherwise noted, the viscosity values refer to a pressure of 100 kPa (1 bar) . Jet A JF1107 was tested as a range scan from -20°C to -55°C with 1°C steps. Pascal is a unit of force just like horsepower. This variation is provided in Crane (1988) as a graph for hydrocarbon vapors and natural gases, and as an equation for other common gases. The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow. According to the kinetic theory of gases, viscosity should be proportional to the square root of the absolute temperature, in practice, it increases more rapidly. It refers to the fluid’s internal resistance to flow when force is applied. Dynamic (absolute) viscosity is the tangential force per unit area required to move one horizontal plane with respect to an other plane - at an unit velocity - when … The kinematic viscosity of the lubricants, i.e. The viscosity profiles of the lubricants investigated were determined using the Ubbelohde method DIN 51562 (Fig. Fluid Viscosity, sometimes referred to as dynamic viscosity or absolute viscosity, is the fluid's resistance to flow, which is caused by a shearing stress within a flowing fluid and between a flowing fluid and its container. To accurately measure either absolute or kinematic viscosity, or to measure of a fluid under the force of gravity, it is multiplied by its density. The fuels differ in their freeze point specifications (-40 °C for JET A and -47 °C for Jet A1). d1 density of liquid 1. d2 density of water 0.997 g/cm3. The notation P = 0 indicates that the low-pressure limiting value is given . Learn more about kinematic viscosity formula and related solved examples. These are the conventions used in this book. Due to this a shear stress(\tau ) is developed in the fluid element. For air at sea level pressure and 20 °C, … The data gathered by the group are documented in the table below. The Sutherland formula canbe used to calculate the viscosity of a gas at a specified temperature if the Sutherland constant isavailable for the gas. Given two known temperature-viscosity points, the viscosity of a liquid can be calculated for a target temperature. L / L 2 . 19 Calculation: Calculate the viscosity by the relationships: η1 η2 t1d1 t2d2 η1 is viscosity of liquid 1. η2 is viscosity of water 0.891 poise. You need not bother about the topic of viscosity anymore as we have mentioned all the Viscosity Formulas completely. Dynamic viscosity: Dynamic viscosity is also known as absolute viscosity. The equation is written. Fluid Viscosity, sometimes referred to as dynamic viscosity or absolute viscosity, is the fluid's resistance to flow, which is caused by a shearing stress within a flowing fluid and between a flowing fluid and its container. Any two different fluids can have the same dynamic viscosity but will never have the same kinematic viscosity because of the density difference. Coefficient of Viscosity Unit and Dimension. Dynamic viscosity of gases is primarily a function of temperature. On solving we get, Dimensional formula for η = M L − 1 T − 1 and it is equivalent to Kg m ^ -1 s ^ -1. CGS Unit of Viscosity. Formulas for Viscosity A widely used formula for the calculation of viscosity of gases is the Sutherland Equation given by (1. There are two types of viscosity: the absolute or dynamic viscosity, and the kinematic viscosity. The standard deviation (σ) and the values of fitting degree (R 2) for Δη of PEG 200 + 1,2-PDA binary system at T = (293.15 to 318.15) K with temperature difference about 5 K were listed in Table S6. Therefore typically viscosity of JET A is higher and JET A also shows a steeper increase of viscosity with decreasing temperatures. The most acceptable method in the United States is the Saybolt viscosimeter, Figure 40.17.. Sign … Due to this a shear stress(\tau ) is developed in the fluid element. Absolute viscosity in terms of leakage velocity viscosity_of_oil = (Change in pressure)* (Radius)^2/ (8*Incremental length in the direction of Velocity*Velocity) Go Density of liquid in terms of loss of liquid head density = (64*Viscosity of oil*Velocity)/ (2*[g]*Loss of liquid head* (Outside diameter of seal ring)^2) Go Loss of liquid head (1967)[40] 4 68.1–70.2 0.83 30–30.3 10.3 Boyd(1930)[43] 68 303–343 7.13–19.4 2.46–6.87 5.72 Several engineering units are used to express viscosity, but the most common by far are centistoke (cSt) for kinematic viscosity and the centipoise (cP) for dynamic (absolute) viscosity. Answer (1 of 6): Viscosity is the resistance offered by the fluid layers when there is a relative movement between them. By dividing the absolute or dynamic viscosity of a fluid with the fluid mass density, kinematic viscosity can be obtained, and Centipoise (cP) is the unit of measure for dynamic viscosity. Solved Examples for Kinematic Viscosity Formula. The equation is written. By dividing the absolute or dynamic viscosity of a fluid with the fluid mass density, kinematic viscosity can be obtained, and Centipoise (cP) is the unit of measure for dynamic viscosity. Absolute viscosity is a parameter for measuring the internal resistance in the fluid. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.. For further definitions, go to Absolute (dynamic) and kinematic viscosity. It will be discussed and used in example calculations. The notation P = 0 indicates that the low-pressure limiting value is given . The dif- This article discusses several models of this dependence, ranging from rigorous first-principles calculations for monatomic gases, to empirical correlations for liquids. The viscosity on this page is the dynamic (absolute) viscosity. The Absolute Viscosity formula is defined as the force needed by a fluid to overcome its own internal molecular friction so that it can flow and is represented as υ = (μ*d*ρFluid)/Re or absolute_viscosity_of_fluid = (Viscosity of fluid*Diameter*Density of Fluid)/Reynolds Number. Given two known temperature-viscosity points, the viscosity of a liquid can be calculated for a target temperature. Common Dynamic or Absolute Viscosity Units 1 Pascal second (Poiseuille) = 1000 Centipoise 1 Pascal second (Poiseuille) = 10 Dyne second / centimetre 2 1 Pascal second (Poiseuille) = 0.0102 Gram force seconds / centimetre 2 1 Pascal second (Poiseuille) = 10 Gram / centimetre second The Absolute Temperature in Terms of Viscosity formula is defined as the ratio of constant B to the difference of logarithmic function of the viscosity of oil and constant A is calculated using absolute_temperature = Constant B /(ln (Viscosity of oil)-Constant a).To calculate Absolute Temperature in Terms of Viscosity, you need Constant B (B), Viscosity of oil (μ) & Constant a (A). Kinematic viscosity: Kinematic viscosity is a measure of the viscosity of a (usually Newtonian) fluid in motion. a unit difference of velocity between two parallel layers of the liquid, unit distance apart.” Now, Kinematic viscosity = dynamic or absolute viscosity/density and density = mass/volume = kg m-3. CGS unit of dynamic viscosity is Poise. Kinematic viscosity is expressed as the ratio of fluid dynamic viscosity to its density. This question 1 Figu res in brackets indicate the literature references al the end of this papt~r. This article discusses several models of this dependence, ranging from rigorous first-principles calculations for monatomic gases, to empirical correlations for liquids. Viscosity is the measure of a fluid's resistance to flow. Any calculation involving the movement of fluids requires a value of viscosity. Dynamic viscosity of gases is primarily a function of temperature. Many a times, the ratio of dynamic viscosity to density appears frequently and this ratio is given by the name kinematic … Fluid Viscosity, sometimes referred to as dynamic viscosity or absolute viscosity, is the fluid's resistance to flow, which is caused by a shearing stress within a flowing fluid and between a flowing fluid and its container. The unit of measurement is m 2 s-1. Stay tuned with BYJU’S for more such interesting articles. 1.8 . The kinematic viscosity and absolute viscosity can be converted using the following formulas: Kinematic viscosity (stokes) = = (cm 2/sec), (centistokes = = mm /s) 26.13). Informally, viscosity is the quantity that describes a fluid's resistance to flow. It is possible to calculate the minimum and maximum of the VG30. Crane promotes the use of the centipoise (also a metric unit) as the standard unit of absolute viscosity. where, is the shear strain rate and μ is the dynamic (or absolute) viscosity of the fluid. The viscosity of a liquid as a function of temperature can be approximated with the Andrade correlation. The density is given by, ρ = ν/μ. It can also be thought of as a measure of a fluid’s thickness or its resistance to objects passing through it. In 1893 William Sutherland, an Australian physicist, published a relationship between the dynamic viscosity, , and the absolute temperature, , of an ideal gas. Kinematic viscosity is calculated by dividing the absolute number by the density of the fluid. A water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds. ν = μ/ρ. Solution to Reynolds Number Question . Calculate the viscosity of the liquid. Therefore, the density of a fluid is 3.0612 kg/m3. ν = η / ρ . This variation is provided in Crane (1988) as a graph for hydrocarbon vapors and natural gases, and as an equation for other common gases. The unit employed for measuring the dynamic viscosity of a fluid is Pa.s (where ‘Pa’ stands for Pascal and ‘s’ stands for seconds). It corresponds roughly to the intuitive notion of a fluid's 'thickness'. The constant (K) of the instrument is determined using a liquid of known viscosity or by reference to tables supplied by the instrument manufacturer. For instance, honey has a much higher viscosity than water . η= F/ [A×(u/h)] η= τ /(u/h) N-s/m² Kinematic Viscosity : It is defined as the ratio of absolute viscosity to the density of fluid. Here's a JavaScript program to calculate the coefficient of viscosity and the Reynolds number for different altitude, length, and speed. Viscosity is nothing but a fluid's resistance to flow. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.. For further definitions, go to Absolute (dynamic) and kinematic viscosity. formula is: Where: N S = viscosity of solution N 0 = viscosity of solvent c = concentration in grams/mL Kinematic Viscosity Definition: The absolute viscosity of a fluid divided by the density of the fluid. low-viscosity products, the specific gravity of KF-96 is nearly 1 at 25°C, so the value of the viscosity is almost the same whether expressed in centistokes or centipoise. Viscosity correction factor for ASME/API RP 520 and EN ISO 4126. Solve for the unknown data #'s 1-9, … The formula for dynamic or absolute viscosity is 1 centipoise (cP) equals 1 millipascal-second (mPa-s). The units of dynamic viscosity are: Force / area x time The Pascal unit (Pa) is used to describe pressure or stress = force per area This unit can be combined with time (sec) to define dynamic viscosity. The kinematic viscosity in cSt at 40°C is the basis for the ISO 3448 kinematic viscosity grading system, making it the international standard. The difference between VG10 and VG-30 bitumen is in their viscosity level. Test duration: 2h 15 min. Formula: The kinematic viscosity = Dynamic viscosity / Fluid mass density. Viscosity quantifies the internal frictional force between adjacent layers of fluid that are in relative motion. The dimensional formula of viscosity is [ML-1 T-1]. 1 centipoise = 0.01 gram/cm-sec or multiply centipoise by 1/density (g/cm3) to get centistokes. Dynamic viscosity (sometimes referred to as Absolute viscosity) is obtained by dividing the Shear stress by the rate of shear strain. to convert a value from gauge pressure (PG) to absolute pressure (Pas), simply add the atmospheric pressure: Pabs = PG + Patm Formula: The kinematic viscosity = Dynamic viscosity / Fluid mass density.
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