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excess air level

19:29 Aug 14, 2006
This question was closed without grading. Reason: No acceptable answer

English language (monolingual) [PRO]
Tech/Engineering - Chemistry; Chem Sci/Eng / gas concentration
English term or phrase: excess air level
gaseous concentrations: The mass of a particular gas per unit volume of dry gas in the enclosed gas stream, unless otherwise stated.
If expressed by volume, these concentrations could be standardized by using a reference excess air level (for example: 3% oxygen)
Jörgen Slet
Estonia
Local time: 21:43


SUMMARY OF ALL EXPLANATIONS PROVIDED
4 +1an exceeding air supply
Clauwolf
2 +1ratio of a particular gas to overall dry air
ErichEko ⟹⭐


Discussion entries: 6





  

Answers


1 hr   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +1
an exceeding air supply


Explanation:
:) According to Darek's definition

Clauwolf
Local time: 15:43
Native speaker of: Native in PortuguesePortuguese
PRO pts in category: 8
Notes to answerer
Asker: This is about gas concentrations in gaseous emissions


Peer comments on this answer (and responses from the answerer)
agree  Ana L Fazio-Kroll
5 hrs
  -> thanks
disagree  Marie-Hélène Hayles: "exceeding" cannot be used in this context - the correct term is "excess". They are not synonyms.
1 day 13 hrs
  -> excess is "tecnically" wrong
agree  Ben Shang
1 day 14 hrs
  -> thanks
Login to enter a peer comment (or grade)

6 hrs   confidence: Answerer confidence 2/5Answerer confidence 2/5 peer agreement (net): +1
ratio of a particular gas to overall dry air


Explanation:
Just IMHO.

Simply stated, excess air = any particular gas you are focusing on.

gaseous concentration is usually expressed as: mass / volume = kg/m3.

mass is OF particular gas (e.g. oxygen); volume is OF dry air.

If expressed by volume, then it is a ratio of particular gas to dry air.
Common expression of this ratio is percentage.

It is called "excess air level" or "excess air percentage" as the particular gas is considered an excess of overall air.

--------------------------------------------------
Note added at 6 hrs (2006-08-15 02:08:44 GMT)
--------------------------------------------------

So, if excess air level of an oxygen is 3%, it means that a litre of dry air contains 30cc of oxygen.

ErichEko ⟹⭐
Indonesia
Local time: 01:43
Works in field
Native speaker of: Native in IndonesianIndonesian
PRO pts in category: 5
Notes to answerer
Asker: If it's just volumetric concentration then I absolutely don't understand why it would be called the way it is. And I'm still confused about the point of "standardizing concentrations by using a reference excess air level (for example: 3% oxygen)". May it mean something like "the conc. of the pollutant is half of the normal atmospheric concentration of oxygen" ?

Asker: Oh and in volumetric concentrations it should not make any difference whether the air or gas is dry or not ?


Peer comments on this answer (and responses from the answerer)
agree  Ben Shang
1 day 9 hrs
  -> Thanks. I hope I'll have time to research to be able to answer Jorgen's questions.
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