These mixtures, or primary reference materials, are primary realisations of the mole as gas mixtures at the top of the traceability hierarchy and are provided with some of the lowest uncertainties available worldwide. (npl.co.uk)
ISO 14912:2003 defines the following quantities commonly used to express the composition of gas mixtures: mole fraction, mass fraction and volume fraction, as well as mole concentration, mass concentration and volume concentration. (iso.org)
Oxygen7
Expiratory flow limitation and the response to breathing a helium-oxygen gas mixture in a canine model of pulmonary emphysema. (jci.org)
During forced vital capacity deflation, in an open-chest preparation, maximum expiratory flow, choke-point locations, and the response to breathing an 80:20 helium/oxygen gas mixture were determined at multiple lung volumes. (jci.org)
The interactions of charged dust grains in plasma where molecules of Oxygen gas are present and the ef- fect on the discharge of the ambient gas is investigated in presence of magnetic field.The particle in cell model was used to simulate electrons motion in addition to using Monte Carlo method to simulate the electrons collisions with neutrals. (gla.ac.uk)
Sizing of propane gas pipe lines with pressures above 5 psig (35 kPa) . (engineeringtoolbox.com)
Temperature6
Mixtures with equivalence ratios between 0.7 and 1.6, and volume fractions of simulated residual gas between 0 and 0.3 were tested at pressures from 0.4 atm to 12 atm and unburned gas temperatures from 350 K to 550 K. The laminar burning speeds were fitted to a power function expression involving the unburned gas pressure and temperature, and the diluent fraction. (sae.org)
The pressure and temperature dependences of the laminar burning speed for undiluted mixtures agreed well with values reported by other investigators for various fuels, indicating that these dependences are independent of fuel type. (sae.org)
Conversion between different quantities means calculating the numerical value of an analyte content in terms of one of the quantities listed above from the numerical value of the same analyte content, at the same pressure and temperature of the gas mixture, given in terms of another of these quantities. (iso.org)
Conversion between different state conditions means calculating the numerical value of an analyte content, in terms of one of the quantities listed above, under one set of state conditions from the numerical value of the same quantity under another set of state conditions, i.e. pressure and temperature, of the gas mixture. (iso.org)
Therefore any state conditions (pressure and temperature) considered need to be well outside from the condensation region of the gas mixture and that of each of the specified analytes. (iso.org)
See also the Gas Compressibility Factor, z-factor for air, dependent on pressure and temperature and used to account for deviation from the ideal situation. (engineeringtoolbox.com)
Reactions1
Kinetics and mechanisms of the gas-phase reactions of the hydroxyl radical with organic compounds under atmospheric conditions. (cdc.gov)
Hydrogen1
NPL produces range of reference gas standards for the hydrogen industry. (npl.co.uk)
Composition2
Gas mixture composition can be converted simultaneously between different quantities of composition and different state conditions by combination of the two types of conversion. (iso.org)
One of the main advantages is the very high separation power, making the technique ideal for unravelling the composition of complex mixtures. (wikipedia.org)
Chemical2
Mustard-lewisite (military designation HL) is a mixture of two chemical warfare agents (sulfur mustard and lewisite) and has some properties of both. (cdc.gov)
Some chemicals listed in this database or not pure chemical compounds, rather they are mixtures/solutions of chemicals. (environmentalchemistry.com)
Experimental2
Gives a complete list of the corrosiveness for pure gases and a calculation method relating to the corrosiveness of gas mixtures which is applicable in the absence of experimental data to each of their components. (iso.org)
Unresolved complex mixture (UCM), or hump, is a feature frequently observed in gas chromatographic (GC) data of crude oils and extracts from organisms exposed to oil. (wikipedia.org)
A NIOSH-certified CBRN PAPR with a loose-fitting face-piece, hood, or helmet and a filter or a combination organic vapor, acid gas, and particulate cartridge/filter combination or a continuous flow respirator for air levels greater than AEGL-1. (cdc.gov)
This article describes work leading to a microfabricated preconcentrator-focuser (microPCF) designed for inte-gration into a wearable microfabricated gas chromatograph (microGC) for monitoring workplace exposures to volatile organic compounds (VOCs) ranging in vapor pressure from approximately 0.03 to 13 kPa at concentrations near their respective Threshold Limit Values. (cdc.gov)
With respect to the density dependence of maximum expiratory flow, this response did not differ from control values in four dogs with emphysema in which frictional pressure losses upstream from choke-points did not differ on the two gas mixtures. (jci.org)
Purge2
It is also used as a back purge gas on stainless steel materials. (lindeus.com)
It is also suitable for use with GTAW when welding 300 series austenitic stainless steels and as a back purge gas on stainless steel materials. (lindeus.com)
The diagrams below indicates required capacity for relief valves on LPG - Liquefied Petroleum Gas - tanks above and below ground and vaporizers. (engineeringtoolbox.com)
Molecules1
The ideal gas law treats the molecules of a gas as point particles with perfectly elastic collisions. (engineeringtoolbox.com)
Equations1
If a gas behaves ideally, both a and b are zero, and van der Waals equations approaches the ideal gas law PV=nRT. (engineeringtoolbox.com)
Temperatures1
Rhodes, D. and Keck, J., "Laminar Burning Speed Measurements of Indolene-Air-Diluent Mixtures at High Pressures and Temperatures," SAE Technical Paper 850047, 1985, https://doi.org/10.4271/850047 . (sae.org)
Site1
According to this theory, maximum expiratory flow is related both to the cross-sectional area and compliance at an airway site where a critical gas velocity is first reached ("choke-point") and to gas density. (jci.org)
Pure1
Our primary reference gas mixtures (PRGMs) are prepared gravimetrically from pure components and are validated using our suite of state-of-the-art gas analysers. (npl.co.uk)
Applicable1
ISO 14912:2003 is only applicable to homogeneous and stable gas mixtures. (iso.org)
Plasma gas1
It is recommended as the plasma gas with plasma arc gauging when cutting aluminum and stainless steel, and when cut quality and face appearance are critical. (lindeus.com)
Function1
The percentage reduction in laminar burning speed due to the addition of simulated residual gas was found to be a function only of the amount added, independent of the properties of the mixture. (sae.org)
Components1
Analysis of the hydrocarbon fraction of crude oils by GC reveals a complex mixture containing many thousands of individual components. (wikipedia.org)
Capacity1
Carrying capacity of house gas pipes - in imperial and metric units. (engineeringtoolbox.com)
Products1
Agricultural: If mustard-lewisite mixture is released into the air as a liquid spray (aerosol), it has the potential to contaminate agricultural products. (cdc.gov)
Liquid1
Indoor Air: Mustard-Lewisite mixture can be released into indoor air as a liquid spray (aerosol). (cdc.gov)
Equipment1
Find the right welding and specialty gas equipment, supplies and information. (lindeus.com)
Wide1
Our production facilities, wide variety of gas and process management programs, and delivery systems are all designed to help get you the gas you need, when and how you need it. (lindeus.com)
Process1
Our HydroStar ® shielding gas blends are primarily used for joining austenitic stainless steels with the GTAW process. (lindeus.com)
At Linde, we promise an uninterrupted supply of any type of gas, at any quantity, almost anywhere in the world. (lindeus.com)
A NIOSH-certified CBRN tight-fitting APR with a canister-type gas mask or CBRN PAPR for air levels greater than AEGL-2. (cdc.gov)
Large1
A dual-cavity device containing 1.4 mg of C-X and 2.0 mg of C-B was capable of selectively and quantitatively capturing a mixture of 14 VOCs at low-ppm concentrations in a few minutes from sample volumes sufficiently large to permit detection at relevant concentrations for workplace applications with the microGC detector that we ultimately plan to use. (cdc.gov)