air composition

air composition

[′er ‚käm·pə′zish·ən]
(meteorology)
The kinds and amounts of the constituent substances of air, the amounts being expressed as percentages of the total volume or mass.
References in periodicals archive ?
Contract award notice: Enose networks and platform for determining changes in air composition.
Emmanuel told the mayor that Belgium used to enjoy better air quality before the facility was put up, 'but, in the months following its operation, there were changes in the air composition, suspecting the particles to have come from the facility.
Finish performance was found to be strongly dependent on environmental variables, such as chemical air composition, temperature, humidity and laminar airflow rates.
For the sake of maintaining a near-constant fuel and air composition, each non-knocking ("phasing") experiment was followed by the corresponding KLST experiment.
The air composition of underground environment in the Cacica and Ocna Dej salt mines were determined with RAE gas detection tubes and the following gases and volatile compounds were assayed: O2 (%), CO2 (%), CO (ppmv), SO2 (ppmv), O3 (ppmv), Cl2 (ppmv), NH3 (ppmv), NOX (ppmv), HC (ppmv), H2O (mg/L).
It said a web browser or search engine located at the user's site might obtain information on the environment, such as temperature, humidity, light, sound, air composition, from sensors.
The company's approach is to identify small variations in the air composition within an arm-length to the driver's mouth and nose.
Sensors that measure temperature and air composition can also be distributed.
The lab is currently developing a membrane that would be capable of varying the air composition to supply added oxygen, or perhaps nitrogen, to the engine as needed.
Alternatives to this include cold and heat treatment, inspection of produce, physical removal of pests, altering air composition, lasers and protective coatings of natural waxes.
The 10-year gastfastness figure is based on a testing ratio of gases typical to indoor air composition (O3: NOx:SOx--3:19:1) with 100 times concentration in order to accelerate color fading.
The 10 year gas fastness figure is based on a testing ratio of gases typical to an indoor air composition (O3::NOx:SOx=3:19:1) with 100 times concentration in order to accelerate color fading.