Air - Thermophysical Properties - Thermal properties of air at different temperatures - density, viscosity, critical temperature and pressure, triple point, enthalpi and entropi, thermal conductivity and diffusivity and more.Temperature and Pressure - Online calculator, figures and tables showing density, specific weight and thermal expansion coefficients of air at temperatures ranging -100 to 1600 ☌ (-140 to 2900 ☏) at atmospheric and higher pressure - Imperial and SI Units. Air - Density, Specific Weight and Thermal Expansion Coefficient vs.Pressure and Temperatures - Air density at pressure ranging 1 to 10 000 bara (14.5 - 145000 psi) and constant selected temperatures. Densities - Densities of solids, liquids and gases.Material Properties - Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.Gases and Compressed Air - Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves.Involving velocity, pressure, density and temperature as functions of space and time. Fluid Mechanics - The study of fluids - liquids and gases.Air Psychrometrics - Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content. Ρ ref = density reference at elevation 0 ft and temperature 70 oF - (0.075 lb m/ft 3)į = correction factor from the chart above Example - Density at Elevation 4000 ft and Temperature 300 oFįrom the chart above - at elevation 4000 ft and temperature 300 oF the correction factor is approximate 1.7. Ρ = density at the given temperature and elevation (lb m/ft 3) The density at a given temperature and elevation can then be calculated as The chart above can be used to estimate " temperature vs. The specific volume of standard air at a certain altitude can be calculated by multiplying with the volume correction factor below Note! - other definitions of STP and NTP are widely used. NTP - Normal Temperature and Pressure (commonly used for testing and documentation of fan capacities) is 293.15 K (20 ☌, 68 ☏) and absolute pressure 1 atm (101.325 Pa, 14.696 psi) according NIST - National Institiute of Standards and Technology.STP - Standard Temperature and Pressure is 273.15 K (0 ☌, 32 ☏) and absolute pressure exactly 10 5 Pa (100 kPa, 1 bar) - according IUPAC - International Union of Pure and Applied Chemistry - since 1982.Air density and specific volume as functions of altitude above sea level can be indicated as in the diagrams below:
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