air density definition
The mass per unit volume of air. The mass per unit of volume of air in terms of weight per unit of volume. The unit for measurement is kilogram per cubic meter (i.e., kg/m3). The illustration shows the values of air density in a standard atmosphere at various altitudes. The transducer, however, moves in a graduated manner and is able to calculate precisely how close the wing is to its stagnation point or stalling angle of attack, unaffected by aircraft weight, wing loading, gear configuration, air density or slip/skid. Density of air calculations[edit] Depending on the measuring instruments, use, area of expertise and necessary rigor of the result different calculation criteria and sets of equations for the calculation of the density of air are used. At higher elevations the air density is much different than at sea level, and our turbocharged engines have an advantage because they are less impacted by the thinner air than are the normally aspirated engines of our competitors, said Russell Smith, team owner, Kinetic Motorsports. 1 At IUPAC standard temperature and pressure (0 °C and 100 kPa), dry air has a density of 1.2754 kg/m3. 2  At 20 °C and 101.325 kPa, dry air has a density of 1.2041 kg/m3.  At 70 °F and 14.696 psi, dry air has a density of 0.074887lbm/ft3. The density of air, (Greek: rho) (air density), is the mass per unit volume of Earth's atmosphere. Air density, like air pressure, decreases with increasing altitude. It also changes with variation in temperature or humidity. Because the gravity of the Earth holds the atmosphere to the surface, as altitude increases, air density, pressure, and temperature (for lower altitudes) decrease. At the edge of space, the density is almost zero. Earth's atmosphere is composed of air. Air is a mixture of gases, 78% nitrogen and 21% oxygen with traces of water vapor, carbon dioxide, argon, and various other components. We usually model air as a uniform (no variation or fluctuation) gas with properties that are averaged from all the individual components. When a gas is moving, it is convenient to use the density of a gas, which is the mass divided by the volume the gas occupies. The sea level standard value of air density r is. r = 1.229 kilograms/cubic meters = .00237 slug/cubic feet. When working with a static or unmoving gas, it is more convenient to use specific volume, which is the volume divided by the mass. Density of air. The density of air, ρ (Greek: rho) (air density), is the mass per unit volume of Earth's atmosphere, and is a useful value in aeronautics and other sciences. Air density decreases with increasing altitude, as does air pressure. It also changes with variances in temperature or humidity.
It is the mass per unit volume of Earth's atmosphere, and is a useful value in aeronautics and other sciences.