This question was closed without grading. Reason: No acceptable answer
Aug 14, 2006 19:29
18 yrs ago
1 viewer *
English term
Estonia
19 years of biomedical translation
Native in: Estonian 
Works in: English to Estonian, Estonian to English
excess air level
English
Tech/Engineering
Chemistry; Chem Sci/Eng
gas concentration
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)
If expressed by volume, these concentrations could be standardized by using a reference excess air level (for example: 3% oxygen)
Responses
| 4 +1 | an exceeding air supply |
Clauwolf
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| 2 +1 | ratio of a particular gas to overall dry air |
ErichEko ⟹⭐
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Responses
+1
1 hr
an exceeding air supply
:) According to Darek's definition
Note from asker:
| This is about gas concentrations in gaseous emissions |
Peer comment(s):
| agree |
Ana L Fazio-Kroll
5 hrs
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thanks
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| disagree |
Marie-Hélène Hayles
: "exceeding" cannot be used in this context - the correct term is "excess". They are not synonyms.
1 day 13 hrs
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excess is "tecnically" wrong
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| agree |
Ben Shang
1 day 14 hrs
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thanks
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+1
6 hrs
ErichEko ⟹⭐
Indonesia
Indonesia
Works in field
Indonesia
Legal, Marketing, Biz, Software, Games
Native in: Indonesian (Variant: Standard-Indonesia) 
Works in: English to Indonesian, Indonesian to English
Related KudoZ points
:
5
ratio of a particular gas to overall dry air
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.
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Note added at 6 hrs (2006-08-15 02:08:44 GMT)
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So, if excess air level of an oxygen is 3%, it means that a litre of dry air contains 30cc of oxygen.
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.
Note from 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" ? |
| Oh and in volumetric concentrations it should not make any difference whether the air or gas is dry or not ? |
Peer comment(s):
| agree |
Ben Shang
1 day 9 hrs
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Thanks. I hope I'll have time to research to be able to answer Jorgen's questions.
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Discussion
Thank you for the link, VPUHING. I will now close the question.