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## specific volume of air

Specific Volume: Specific Volume: Density: where, v = Specific Volume, ρ = Density. The "specific" of specific volume simply means "divided by mass". Gatley (2009), ASHRAE RP-1485 Final Report. The specific volume of standard air at a certain altitude can be calculated by multiplying with the volume correction factor below, The chart above can be used to estimate "temperature vs. elevation density correction factor". T as dry air is a mixture of gases, its molar mass is the weighted average of the molar masses of its components, Olson, Wayne M. (2000) AFFTC-TIH-99-01, Aircraft Performance Flight. and one may approximate: Which is identical to the isothermal solution, except that Hn, the height scale of the exponential fall for density (as well as for number density n), is not equal to RT0/g M as one would expect for an isothermal atmosphere, but rather: Note that for different gasses, the value of Hn differs, according to the molar mass M: It is 10.9 for nitrogen, 9.2 for oxygen and 6.3 for carbon dioxide. meters above sea level is approximated by the following formula (only valid inside the troposphere, no more than ~18 km above Earth's surface (and lower away from Equator)): The pressure at altitude The density at a given temperature and elevation can then be calculated as, ρ = ρref / f                               (1), ρ = density at the given temperature and elevation (lbm/ft3), ρref = density reference at elevation 0 ft and temperature 70 oF  - (0.075 lbm/ft3), f = correction factor from the chart above, From the chart above - at elevation 4000 ft and temperature 300 oF the correction factor is approximate 1.7. To calculate the density of air as a function of altitude, one requires additional parameters. Specific volume may be calculated or measured for any state of matter, but it is most often used in calculations involving gases . We don't collect information from our users. F.R. 0 {\displaystyle p_{d}} Specific volume of air. {\displaystyle {\frac {Lh}{T_{0}}}<0.25} The standard unit for specific volume is cubic meters per kilogram (m 3 /kg), although it may be expressed in terms of milliliters … Ines (2013), Estimating Effective Soil Hydraulic Properties Using Spatially Distributed Soil Moisture and Evapotranspiration, Vadose Zone Journal, 12(3). This equation will give the result of pressure in, This page was last edited on 1 November 2020, at 18:21. Notice that the average specific volume of blood is almost identical to that of water: 0.00100 m3/kg.. It also changes with variation in atmospheric pressure, temperature and humidity. {\displaystyle h} To convert m3/kg to cm3/g, multiply by 1000; conversely, multiply by 0.001. ρ The density of humid air is found by: The vapor pressure of water may be calculated from the saturation vapor pressure and relative humidity. = The density of gases changes with even slight variations in temperature, while densities of liquid and solids, which are generally thought of as incompressible, will change very little. {\displaystyle \ \nu ={\frac {RT}{P}}} h Note that the hydrostatic equation no longer holds for the exponential approximation (unless L is neglected). Specific volume = volume / mass of dry air. To normalize, N, ▽values disregarded for the calculation of total dry air, ▽volumetric composition value adjustment factor (sum of all trace gases, below the (CO. A., and B. P. Mohanty (2012), Uncertainties of Water Fluxes in Soil-Vegetation-Atmosphere Transfer Models: Inverting Surface Soil Moisture and Evapotranspiration Retrieved from Remote Sensing, Vadose Zone Journal, 11(3). The specific volume of standard air at a certain altitude can be calculated by multiplying with the volume correction factor below Altitude and Air Pressure Temperature vs. Elevation Density Correction The chart above can be used to estimate " temperature vs. elevation density correction factor". is found considering partial pressure, resulting in: Where , The table below displays densities and specific volumes for various common substances that may be useful. p Specific Volume of Moist Air - Specific volume is defined as the total volume of humid air per mass unit of dry air; Stack or Flue Effect - The stack or flue effect occurs when the outdoor temperature is lower than indoor temperature Perry, R.H. and Chilton, C.H., eds., Chemical Engineers’ Handbook, 5th ed., McGraw-Hill, 1973.