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For example, such a regulation might limit the concentration of NOx to 55 ppmv in a dry combustion exhaust gas corrected to 3 volume percent O 2. As another example, a regulation might limit the concentration of particulate matter to 0.1 grain per standard cubic foot (i.e., scf) of dry exhaust gas corrected to 12 volume percent CO 2.
As an example, a measured NO x concentration of 45 ppmv in a dry gas having 5 volume % O 2 is: 45 × ( 20.9 - 3 ) ÷ ( 20.9 - 5 ) = 50.7 ppmv of NO x. when corrected to a dry gas having a specified reference O 2 content of 3 volume %. Note: The measured gas concentration C m must first be corrected to a dry basis before using the above equation.
[b] Similarly, a metering pump that injects a trace chemical into the main process line at the proportional flow rate Q p = 12 ppm, is doing so at a rate that may be expressed in a variety of volumetric units, including 125 μL/L, 125 μ gal / gal, 125 cm 3 /m 3, etc. In nuclear magnetic resonance spectroscopy (NMR), chemical shift is usually ...
Composition of dry atmosphere, by volume [ note 1] [ note 2] Gas (and others) Various [1] CIPM-2007 [2] ASHRAE [3] Schlatter [4] ICAO [5] US StdAtm76 [6] Tap. to. expand. or. collapse. table ppmv [ note 3] percentage ppmv: percentage ppmv: percentage ppmv percentage ppmv percentage ppmv percentage Nitrogen: N 2: 780,800: 78.080%: 780,848: 78 ...
The resulting chemical reaction can cause an explosion or a breakdown of the chemicals releasing toxic gases. Water should be used in that case. [8] [9] ABC dry chemical is inappropriate for certain metal fires and does not possess a saponification characteristic and should therefore not be used on Class K / Class F fires. [10]
V = air or gas volume of the closed space or room in cubic feet, cubic metres or litres; Q = ventilation rate into or out of the room in cubic feet per minute, cubic metres per hour or litres per second; C initial = initial concentration of a vapor inside the room measured in ppm; C final = final reduced concentration of the vapor inside the ...
Volume concentration, % Mass concentration, g/(100 ml) at 15.56 °C Density relative to 4 °C water Density at 20 °C relative to 20 °C water Density at 25 °C relative to 25 °C water Freezing temperature, °C 10 °C 20 °C 25 °C 30 °C
It is the same concept as volume percent (vol%) except that the latter is expressed with a denominator of 100, e.g., 18%. The volume fraction coincides with the volume concentration in ideal solutions where the volumes of the constituents are additive (the volume of the solution is equal to the sum of the volumes of its ingredients).