air viscosity calculator air viscosity calculator

confusing, the boundary layer may Theviscosityof afluidis a measure of itsresistanceto gradual deformation byshear stressortensile stress. A Newtonian material is referred to as true liquid since the viscosity or consistency is not affected by shear such as agitation or pumping at a constant temperature. Degree Engler is used in Great Britain as a scale to measure kinematic viscosity. Enthalpy change and temperature rise when heating humid air without adding moisture. and the Reynolds number This creates a layer of air near the surface, called a boundary layer, which, in effect, changes the shape of the object. The change in gravity force (weight) of the air volume is the potential lifting force of the balloon. for different altitude, length, and speed. We don't save this data. For example, the viscosity of water is about 89 times greater than the viscosity of air. Some of our calculators and applications let you save application data to your local computer. The Great Sensible Heat Factor is the ratio sensible to total heat in a cooling coil. This creates a layer of air near the surface, called a boundary layer, which, in effect, changes the shape of the object. Rankine: The shearing of the flow of air creates a properly model the effects of the viscous forces relative to the 3 - and gases like air, hydrogen and helium are indicated in the diagram below. these effects, aerodynamicists use Some of our calculators and applications let you save application data to your local computer. Friction Formulas Apps Engineering Book Store You can target the Engineering ToolBox by using AdWords Managed Placements. AddThis use cookies for handling links to social media. the inertial forces are characterized by the product of the Evaporation of water from a water surface - like a swimming pool or an open tank - depends on water temperature, air temperature, air humidity and air velocity above the water surface - online calculator. Specific volume of moist air is defined as the total volume of humid air per mass unit of dry air. forces are generated between the gas and the object. The viscous forces And to make it even more confusing, the flow conditions in and An optional temperature increment can be added or Weast, Robert The method of finding the air density is quite simple. of the program which loads faster on your computer and does not include these instructions. The viscosity of air depends mostly on the temperature. This is a free app that can be used offline on mobile devices. which are Aerodynamic forces depend in a complex way on the viscosity of the gas. Engineering Standards Units in gas viscosity calculation: Viscosity is the internal friction of water making it resist the tendency to flow, particularly through a small opening. The following are tutorials for running Java applets on either IDE: # 10. umar. tau = (mu) * (dV/dy) The value of the dynamic viscosity coefficient is found to be a constant with pressure but the value depends on the temperature of the gas. needed. Viscosity in Engler degrees is the ratio of the time of a flow of 200 cubic centimeters of the fluid whose viscosity is being measured - to the time of flow of 200 cubic centimeters of water at the same temperature (usually 20oC but sometimes 50oC or 100oC) in a standardized Engler viscosity meter. The mass of 10 m3 air can be calculated as, Example - Mass of Air at Temperature 20 oC, From the table above - thedensity of air is 1.205 kg/m3 at 20 oC. In this kinematic viscosity of air calculator, you can easily examine the relationship between the dynamic and kinematic viscosity of air. 65th edition. Temperature must be within the ranges -100 - 1600 C, -150 - 2900 F, 175 - 1900 K and 310-3400 R to get valid values. The boundary layer is very important in determining the Recommended indoor comfort temperatures vs. outdoor temperatures. Estimate the amount of steam required (lb/h in 100 cfm) in humid air. equation for other common gases. Saybolt Universal Seconds is also called the SSU number (Seconds Saybolt Universal) or SSF number (Saybolt Seconds Furol). magnitude of these forces depend on the shape of the object, the range Dry Bulb, Wet Bulb and Dew Point temperatures can be used to determine the state of humid air. Diffusion coefficients (D12) for gases in large excess of air at temperatures ranging 0 - 400 C. Standard Reference Data Act. To calculate the viscosity of a liquid, you'll need a ball, the liquid itself, and a graduated cylinder. and the Reynolds number for an input velocity, length, and altitude. Downloads Engineering Forum As an object moves through a gas, the gas molecules near the object To improve this 'Viscosity conversion Calculator', please fill in questionnaire. gradient of the velocity between the surfaces: where y is the distance between the surfaces and V is the Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Values of Sutherland's constant are from Crane (1988, p.A-5). a shearing force is generated in the fluid between the 1976 Standard Atmosphere Calculator. + Budgets, Strategic Plans and Accountability Reports Water and oils are examples of Newtonian liquids. = viscosity in centipoise at input temperature T Ketchup and mayonnaise are examples of thixotropic materials. Heat Transfer selection. Additional Information: (Click here, for a version of this calculator with metric defaults .) Temperature shall be between 70K and 1400K or 203C and 1127C. security concerns, many users are currently experiencing problems running NASA Glenn If inertial forces (flow rate) are much bigger, and Reynolds number is higher than critical, Re > 2320, fluid flow is turbulent, and if viscous forces are big enough in comparison to . Basic air changing state processes - heating, cooling, mixing, humidifying and dehumidifying by adding steam or water - psychometric diagrams and the Mollier charts. educational applets. Flow of fluids through valves, fittings, and pipe. Plastics Synthetics In short, air velocity in the ducts is calculated by dividing airflow by duct cross-section. Hydraulics Pneumatics LMNO@LMNOeng.com https://www.LMNOeng.com, LMNO Engineering home page (more calculations). A Shear-thinning or pseudo-plastic fluid is a fluid where the viscosity decrease with increased shear rate. Fluid Velocity in pipes 5. The mass of 10 m3 air can be calculated as, m = 10 [m3] * 1.205 [kg/m3] = 12.05 [kg], Example - Lifting Force of a Hot Air Balloon, An air balloon with volume 10 m3 is heated to 100 oC. 8) where b and S are constants and T is temperature expressed in Eq. Moist Air - Specific vs. Manufacturing Processes Pump Power Calculation 3. Kinematic viscosity of air at 1 bar (1 105 Pa, N/m2) and 40oC is 16.97 cSt (16.97 10-6 m2/s). The change in gravity force (weight) of the air volume is the potential lifting force of the balloon. The SI actual unit of dynamic viscosity () is Pascal-second (Pa s), which also can be represented as 1 kg m -1 s -1. The dynamic viscosity coefficient divided by the density is called the Note! Dynamic The Reynolds number is an important dimensionless quantity used to predict whether a flow is laminar or turbulent, and is defined as the ratio of inertial to viscous forces in a fluid . Machine Design Apps Temperature and Pressure, Air - Thermal Diffusivity vs. unless you specifically want to see the effect of changing the temperature from the standard value. subtracted to model a hot or cold day. The drying force of air depends on the air moisture holding capacity and the water surface to air evaporation capacity. similarity parameter Power Transmission Tech. To = reference temperature in degrees Rankine Psychrometric chart in I-P Units at 5000 feet and barometric pressure 24.896 inHG. surfaces. Here is a little calculator for calculating the properties of air. Cookies are only used in the browser to improve user experience. The Aerospaceweb.org Atmospheric Properties Calculator computes conditions of the atmosphere, airspeed conversions, and basic aerodynamic quantities on a reference body. Calculation of moist air properties. inertial forces to viscous Read More: Unit of Resistance Unit of Specific Resistance Surface Energy backspace over the input value, type in your new value, and An air phase diagram included. In this kinematic viscosity of air calculator, you can easily examine the relationship between the dynamic and kinematic viscosity of air. C = Sutherland's constant. similarity parameters Example: Air conditioner has a max. white on blue boxes. Dry and wet bulb temperature, specific volume, relative humidity, enthalpy and more. (Water dynamic viscosity = 1 Pa s, Air dynamic viscosity = 0.018 Pa s and Mercury dynamic viscosity = 1.526 Pa s) Solution: Given, . Saturation pressure of water vapor in moist air vs. temperature. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. From that point the viscosity decreases with increasing agitation. Copyright for NIST Standard Reference Data is governed by Temperature and Pressure, Ammonia Gas - Density vs. Online calculator with figures and tables showing air thermal conductivity vs. temperature and pressure. T = input temperature in degrees Rankine Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Human metabolic heat gain in air conditioned rooms. These applications will - due to browser restrictions - send data between your browser and our server. Reynolds number named after Osborne Reynolds (1842 - 1912), gives the relation between inertial and viscous forces of fluid flow. Note! and Informatics. In ISO 8217 the reference temperature for a residual fluid is 100oC. *Surface tension values are If you find any problems with this calculator or have any questions or suggestions for improvement, please At the critical point there is no change of state when pressure is increased or if heat is added. wind tunnel Select fluid from options box Enter temperature value and choose units Enter number of significant digits for output Browser will re-calculate when a change is made and the mouse is clicked in another box, the Tab key is pushed (Enter key for UNIX), or the Calculate button is clicked. Air properties, Specific heat capacity, Thermal conductivity, Viscosity, If you had the permittivity at altitude that would be cool feature, Thanks for the sharing air properties calculator. We recommend that you DO NOT use it: As a resource called by other software for property data In any critical application Structural Shapes This friction is the effect of (linear) momentum exchange caused by molecules with sufficient energy to move . The flow of gas reacts to the edge of the boundary layer as if it was the . The temperature of the surrounding air is 20 oC. Learn how your comment data is processed. Convert Customer Gas Flow Rate unit of measure to a standard unit of measure for air flow (SCFM or SCCM). Air-handling plant area calculation. Applications and Design 3 Calculations. change value. C., editor. hit the Enter key on the keyboard (this sends your new value to the program). air viscosity versus pressure. Engineering Mathematics pressure The calculator can either be used in manual mode (density, viscosity or kinematic viscosity known); or alternatively use it in . July 21, 2009, 18:04. hydrogen, nitrogen, sulfur dioxide. + Inspector General Hotline The mass of 10 m3 air can be calculated as, wherem = mass [kg]V = volume [m3] = density [kg/m3], Example - Mass of Air at Temperature 20 oC, From the table above - thedensity of air is 1.205 kg/m3 at 20 oC. 1988. Videos Design Manufacture Kinematic viscosity in SSU versus dynamic or absolute viscosity can be expressed as, = B centiStokes (3), B = 4.632 for temperature 100 oF (37.8 oC), B = 4.664 for temperature210oF (98.9 oC). temperature Note the temperature is optional and should be left as 0 Heat gain from persons in air conditioned spaces - in btu/hr. (740) 707-2614 To change input values, click on the input box (black on white), where mu0 and T0 are reference values Flat Plate Stress Calcs This method has largely been replaced by the kinematic viscosity method. See also other properties of Air at varying temperature and pressure: Density and specific weight at varying temperature, Density at varying pressure, Diffusion Coefficients for Gases in Air, Prandtl Number, Specific heat at varying temperature and Specific heat at varying pressure,Thermal Conductivity,Thermal Diffusivity, Properties at gas-liquid equilibrium conditions and Air thermophysical properties at standard conditions and Composition and molecular weight, as well as dynamic and kinematic viscosity of ammonia, benzene, butane, carbon dioxide, ethane, ethanol, ethylene, methane, methanol, nitrogen, oxygen, propane and water. The shear resistance in a fluid is caused by inter-molecular friction exerted when layers of fluid attempt to slide by one another. When you use a dynamic viscosity of water calculator, it also provides viscosity and temperature chart for better understanding: Temperature and Pressure, Air - Diffusion Coefficients of Gases in Excess of Air, Air - Heating, Cooling, Mixing, Humidifying or Dehumidifying Processes, Air - Humidifying by Adding Steam or Water, Air - Humidifying with Steam - Imperial Units, Air - Humidity Measurement from Dry and Wet Bulb Temperature, Air - Moisture Holding Capacity vs. Only emails and answers are saved in our archive. USA. When we know the ISO Viscosity Grade (40) and the viscosity index, we can calculate the viscosity at 100. 1000oF. The Viscosity of Air, Water, Natural Gas, Crude Oil and Its Associated Gases at Oil Field Temperatures and Pressures, No. The viscosity at the target temperature is calculated when you click the 'calculate' button. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! The viscosity of a fluid is highly temperature dependent - and for dynamic or kinematic viscosity to be meaningful the reference temperature must be quoted. Celsius / Kelvin Fahrenheit / Rankine Raumure. Software, Ltd. (All Rights Reserved). Choose the desired type of data: Data type Isothermal properties Isobaric properties Isochoric properties Saturation properties temperature increments Saturation properties pressure increments The calculator is Mechanical Tolerances Specs viscosity of gases is primarily a function of temperature. oC=degrees Celsius, K=Kelvin, oF=degrees Fahrenheit, oR=degrees Air Density Calculator is a handy tool that computes the air density parameter given the temperature and pressure conditions. shape. According to its dynamic viscosity, to which one of these fluids corresponds? Only emails and answers are saved in our archive. HVAC Systems Calcs AddThis use cookies for handling links to social media. The impact of pressure is minor and the viscosity In equation form, that's: P_1V_1=P_2V_2 P 1V 1 = P 2V 2. where P 1 and V 1 are the initial volume and pressure and P 2 and V 2 are the new volume and pressure. This site uses Akismet to reduce spam. At 15 C, the viscosity of air is 1.81 * 10-5 kg/(ms) , 18.1 Pas or 1.81 The user interface allows conversions between common units in the English and Metric systems. It is brought to you by STF Solutions. Just click on the menu button and click of an object. Please read AddThis Privacy for more information. compressibility, or springiness, of the gas. Rankine, lb-s/ft2=pound-second per square foot, slug/ft-s=slug per foot per Re: help! Mass air-flow rate unit converter. This variation is The calculator below can be used to calculate air dynamic or kinematic viscosity at given temperatures and atmospheric pressure.The output dynamic viscosity is given as Pa*s, N*s/m2, cP, mPa*s, lbf*s/ft2 and lbm/(ft*h),while the kinematic viscosity is given as cSt, m2/s, and ft2/s. Aerodynamic For air, another source . of the atmosphere, airspeed conversions, and basic aerodynamic quantities on a reference body. If we denote the like latex paint, behave as "thick" liquids without shear, and very "thin" Kinematic Viscosity Unit Conversion Calculator. National Institute of Standards and momentum conservation equation, s and the kinematic viscosity 15.7 cSt. One of STF Solutions specialties is providing our clients with custom software developed for their needs. fixed and the other surface moving parallel to the fixed surface, Thermodynamic constants of air: nitrogen 78 %, und oxigen 21 %, argon 0.9 %, carbon dioxide 0.04 % Air at normconditions, tnorm= 0oC, pnorm= 1013,25 mbar: Released june 2007 Wikipedia ->Air The calculator is based on methods documented in the official U.S. Standard Atmosphere 1976. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Calculation for double pipe exchanger, air cooled exchanger, lmtd calculation, lmtd correction factors, insulation heat loss and jacketed vessel heat transfer. The following table gives the values of Sutherland's constant and the reference Latent heat is the heat when supplied to or removed from air results in a change in moisture content - the temperature of the air is not changed. The change in state wwhen mixing moist air - enthalpy, heat, temperature and specific humidity. Recommended relative humidity in production and process environments - like libraries, breweries, storages and more. Calculate the coefficient of viscosity of castor oil if a force of 2.5 N is required to move the plate at a velocity of 3 10-2 m s-1 . The influence of humidity on the apparent temperature and the heat index. h) 27. This version includes the lower atmosphere below an altitude of 53.4 miles (86 km). No. AddThis use cookies for handling links to social media. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. We don't collect information from our users. Reynolds Number. Pressure Vessel The value of the dynamic viscosity coefficient is found to be a constant with Dynamic (absolute) and kinematic viscosity of air at 1 atmosphere pressure, at temperatures given as C: Viscosity Dynamic, Absolutecentipoise [cP], gram/(centimeter second) [g/(cm s)] = poise [P], kilogram/meter second [kg/m s]=newton second/square meter [N s/m2]= pascal second [Pa s], pound/(foot hour) [lb/(ft h)],pound/(foot second) [lb/(ft s)], reyn [reyn], See also Absolute or Dynamic Viscosity Unit Converter, Viscosity Kinematiccentistoke [cSt] = square millimeter/second [mm2/s], square foot/hour [ft2/h], square foot/second [ft2/s], square inch/second [in2/s], square meter/hour [m2/h], square meter/second [m2/s], stoke [St] = square centimeter/second [cm2/s], See also Kinematic Viscosity Unit Converter. Temperature must be within the ranges -100 - 1600 C, -140 - 2900 F, 175 - 1900 K and 315 - 3400 R to get valid values. If they are very different, we do not correctly Density and specific volume of air varies with elevation above sea level. The Civil Engineering The proportionality constant is called the coefficient of g = 0.7; H 2 S = 7%; CO 2 = 10%; p = 2,010 psia; T = 75F. Properties of air change along the boiling and condensation curves (temperature and pressure between triple point and critical point conditions). Pipe Pressure Drop Calculation 4. For example, air at 323 K has a viscosity of 1.716 x 10 -5 Pa s, with a Sutherland Constant of 110 K. helium at 273K has a viscosity of 1.9 x 10 -5 Pa s, with a Sutherland Constant of 79.4 K. The spreadsheet also. Properties of air at 1 atm pressure + NASA Privacy Statement, Disclaimer, The relationship between the psycrometric chart and the Mollier diagram. Online calculator, figures and tables showing density, specific weight and thermal expansion coefficients of air at temperatures ranging -100 to 1600 C (-140 to 2900 F) at atmospheric and higher pressure - Imperial and SI Units. 1.8 . The viscosity of air, at atmospheric pressure is the following : Air viscosity at 0c = 0.01722 mPa.s Air viscosity at 25c = 0.0186 mPa.s 2. A more exact kinematic viscosity for waterat20.2oC (68.4oF) is 1.0038 mm2/s (cSt). Absolute humidity is the actual mass of water vapor present in the air water vapor mixture. In my study, there ise a relation/formulation of calculation these step to see assumtions and calculaion. They appear thick or viscous but are possible to pump quite easily. Best Regards. The Reynolds Number formula is: "Re = VD/ " or "Re = VD/v " where " V " is the fluid velocity, " D " is the characteristic distance, " " is the fluid density, " " is the kinematic viscosity, and " " is the dynamic viscosity both of which can be acquired from data tables. Please contact us for consulting or questions about gas viscosity. Pressure. Thermal properties of air at different temperatures - density, viscosity, critical temperature and pressure, triple point, enthalpi and entropi, thermal conductivity and diffusivity and more. Air density and specific weight at atmospheric pressure: Air density at ambient temperature and pressure: Air density at varying pressure and temperature: Air density at gas-liquid equilibrium pressure: Air thermal expansion coefficient at atmospheric pressure: Density, specific weight and thermal expansion coefficient of air at 1 atmosphere pressure, at temperatures given as F: For full table specific weight and thermal expansion coefficient - rotate the screen! Ranging from custom CFD codes to simpler targeted codes, scripts, macros and GUIs for a wide range of specific engineering purposes such as pipe sizing, pressure loss calculations, heat transfer calculations, 1D flow transients, optimization and more. Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! viscosity is not computed. Netbeans Density calculated shall be less than approximately 900kg/m 3 Absolute or dynamic viscosity is used to calculateReynold's Number to determine if a fluid flow is laminar, transient or turbulent. As an object moves through a gas, the gas molecules stick to the surface. 2003-2023 LMNO Engineering, Research, and Example 1: at 5050 feet elevation, 95 deg F air temp, 29.45 inches-Hg barometric pressure and a dew point of 67 deg F, the Density Altitude is calculated as 9252 feet. This example illustrates the steps necessary to calculate oil viscosity requiring correlations for dead oil viscosity, bubblepoint viscosity, undersaturated viscosity, and bubblepoint pressure/solution GOR. Input. Training Online Engineering. There are two related measures of fluid viscosity. The efflux time is Saybolt Universal Seconds (SUS) required for 60 milliliters of a petroleum product to flow through the calibrated orifice of a Saybolt Universal viscometer - under a carefully controlled temperature and as prescribed by test method ASTM D 88. Follow the links below to get values for the listed properties of air at varying pressure and temperature: See also more about atmospheric pressure, and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure,as well as Thermophysical properties of: Acetone, Acetylene, Ammonia, Argon, Benzene, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Helium, Hydrogen, Hydrogen sulfide, Methane, Methanol, Nitrogen, Oxygen, Pentane, Propane, Toluene, Water and Heavy water, D2O. for viscosity is the from the graph on page A-5 in Crane (1988), performing linear interpolation if Table summary 2. + Freedom of Information Act Viscosity models for mixtures. temperature and viscosity for the gases used in the LMNO Engineering calculation. based on methods documented in the official U.S. Standard Atmosphere 1976. forces. ft/h. liquids when subjected to shear. 3. The moisture holding capacity of air increases with temperature. Temperature offset. This calculator allows calculating kinematic viscosity at 40C from the known VI and kinematic viscosity of the oil at 100C: The common equation used to calculate the viscosity by interpolation between two reference points is with the Ubbelohde-Walther equation, which is adopted in ASTM D341. Section Properties Apps The density of the air can be estimated with the Ideal Gas Law, = (1 105 N/m2) / ( (287 J/(kg K)) ((273 oC) + (33 oC)) ), The absolute viscosity can be calculated as, Kinematic viscosity can be converted from SSU to Centistokes with, Centistokes = 0.226 SSU - 195 / SSU (4), Kinematic viscosity of fluids like water, mercury, oils SAE 10 and oil no. Temperature and Pressure, Dynamic (absolute) and kinematic viscosity, Properties at gas-liquid equilibrium conditions, Density of crude oil as function of temperature, 1 lb/gal(UK) = 0.8327 lb/gal(US liq) = 16 oz/gal(UK) = 13.323 oz/gal(US liq) = 168.179 lb/yd, 1 lb/gal(US liq) = 1.2009 lb/gal(UK) = 19.215 oz/gal(UK) = 16 oz/gal(US liq) = 201.97 lb/yd, 1 oz/gal(UK) = 0.8327 oz/gal(US liq) = 6.2360 kg/m, 1 oz/gal(US liq) = 1.2009 oz/gal(UK) = 7.4892 kg/m. We don't collect information from our users. Temperature - Imperial Units, Dry Bulb, Wet Bulb and Dew Point Temperatures, Indoor Comfort Temperatures vs. the surface. kv : mm/s. aerodynamicists rely on This water viscosity calculator will help you determine the viscosity of water at room temperature or any temperature, even those above 300\ \mathrm {\degree C} 300 C! The Aerospaceweb.org Atmospheric Properties Calculator computes conditions = specific weight, units typically [N/m, g = acceleration due to gravity, units typically [m/s, Air - Density, Specific Weight and Thermal Expansion Coefficient vs. The Mollier diagram is a graphic representation of the relationship between air temperature, moisture content and enthalpy - and is a basic design tool for building engineers and designers. The relationship between volume, pressure, temperature and quantity of a gas, including definition of gas density. Altitude. The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. timeVaryingFixedUniformValue: Time-Varying Cylinder Motion in Cross-flow: Tips for tackling the OpenFOAM learning curve, Compressible Aerodynamics Calculator Matlab App, Automatic Airfoil C-Grid Generation for OpenFOAM Rev 1, Compressible Laminar Boundary Layer Numerical Solution, Solving for your own Sutherland Coefficients using Python, Creating curves in blockMesh (An Example), Creating synthetic Schlieren and Shadowgraph images in Paraview. Here's a JavaScript program to calculate the coefficient of viscosity Enhance your theoretical performance . Calculate moist air properties in SI and Imperial units with this online calculator. For air, D. M. Sutherland provides an equation for the dependence on temperature T : mu = mu0 * ( (T / T0)^1.5) * ( (T0 + 198.72) / (T + 198.72))