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ratio

In mathematics, a ratio indicates how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8∶6, which is equivalent to the ratio 4∶3). Similarly, the ratio of lemons to oranges is 6∶8 (or 3∶4) and the ratio of oranges to the total amount of fruit is 8∶14 (or 4∶7).
The numbers in a ratio may be quantities of any kind, such as counts of people or objects, or such as measurements of lengths, weights, time, etc. In most contexts, both numbers are restricted to be positive.
A ratio may be specified either by giving both constituting numbers, written as "a to b" or "a∶b", or by giving just the value of their quotient a/b. Equal quotients correspond to equal ratios.
Consequently, a ratio may be considered as an ordered pair of numbers, a fraction with the first number in the numerator and the second in the denominator, or as the value denoted by this fraction. Ratios of counts, given by (non-zero) natural numbers, are rational numbers, and may sometimes be natural numbers. When two quantities are measured with the same unit, as is often the case, their ratio is a dimensionless number. A quotient of two quantities that are measured with different units is called a rate.

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  1. I

    co /co2 ratio

    i have just commissioned a worcester 28i junior on the combustion test i obtained an 02 % of 4.1 and CO2 %reading of 9.6 with co ppm of 82 giving me a ratio of 0.0008 with the above reading operating the boiler on maximum via the service button, with the boiler operating on minimum i had a CO2...
  2. M

    Vaillant 937 whining noise

    Hi, hope someone can help. My new Vaillant 937, installed 11 months ago, has started making an annoying whining noise when the central heating comes on first in the morning. This lasts for about 10 mins and goes away again until the thermostat demands more heat. I've experimented by turning the...
  3. D

    ferroli DOMI compact F30 B

    hey all was at the above boiler today done a FGA on it and was getting high CO i cleaned out the primary heat exchanger which was in good condition, i removed/inspected the flue seals which were also in good condition. There hot water is going cold as the boiler is cutting out when working on...
  4. P

    CPA analysis ratio

    Hi guys I've been fitting shed load of fires and I've got a boiler service on today can someone advise what the ratio should be on the analyser
  5. M

    Combustion tests with analyzer

    Hi guys, i am in need of some guidance. I have just got a kane analyzer and have just used for the first time on an install the other day. I am wanting to know if these results are all ok? o2% 4.3 CO2% 9.4 CO PPM 107...
  6. S

    Ratio

    Ratio - I got a ratio of 0.0014 on maximum on a mynute 35 he today The manual says 0.001 to 1 , I do not understand the figures as in 0.001 to 1. How does it go
  7. R

    whats the c02 or combustion ratio for worchester 28i jounior that would be grate than

    whats the c02 or combustion ratio for worchester 28i jounior that would be grate thanks:seeya:
  8. A

    air/gas ratio

    eveninng all as the title sugests if you have a boiler that needs setting up on gas valve how is this acheived, just installed a veeissman 200w and cannnot for the life of me work out how to set the min andd max ratings, getting silly readings like 9000ppm, its a real head scrathcher, checked...
  9. G

    johnson starley

    Came across a johnson starley reno 30 today where the combustion ratio was ,0008 so thought i would bring the ratio down but could not locate the throttle on gas valve . Read the MI's and said ,0008 is acceptable and i know that anyway but thought i would tweek it . But how do you bring the...
  10. C

    installed a new vokera 29he compact natural gas, the ratio is 0.0011? is the ratio ok

    please help.it says 0.004 should be right.
  11. M

    combustion ratio?

    hi need some advice as getting bit confused. action point for combustion ratio for a combi not condensing is 0.008 what is the action point for a condensing boiler as have read 0.008 is I.D and 0.004 is A.R is the right???? many thanks
  12. P

    250ppm CO

    i was just curios to check my boiler this morning with my fga and found out that it was giving me CO levels of upto 250ppm and the ratio was around .035 going up when i pulled the probe out and started checking the boiler. Its a balanced flue old glowworm MK2. reason im sharing this here on...
  13. shaky

    Ratio

    Did a service on a Fuelsaver full strip down and reading still 0.1299 any one else have reading after a full strip down service does my head in
  14. M

    ratio of 0.009ppm on a new boiler

    Hi Guys, just a quick one.... i was comissioning a new boiler the other day (ideal logic combi 30) i put my fga on it and ran at full rate and was getting a ratio of 0.009!! co2 reading was 9.32% and gas rate/working pressures were fine. Looked at mi's and they stated that 0.004 was the target...
  15. E

    Performance ratio action??

    hi, what is the action point when carrying out the combustion ratiom for a CH boiler & combi. until last week i was told if boiler etc is ok and ratio is 0.008 that boiler needs father action any thing above is AR and then further I.D. I have now found out that 0.008 is AR and the new action...
  16. S

    regin ratio one click flue gas analyser

    any one seen or used one yet heres a link to the web site REGXA1 - One-Click Ratio Analyser Kit | Regin thinking of getting one as i need an analyser or any one got any idears on a good one?
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