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. Ventilation Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.Material Properties Material properties of gases, fluids and solids - densities, specific heats, viscosities 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.Densities Densities of solids, 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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