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1ppb for O2 and CO2
1000parts per billion = how much gold per to n in grams
1ppm is greater than 1ppb. Reason: ppm is mg/l and ppb is ug/l. And mg is always greater than ug. 1ng = 1000ug 1ug = 1000mg 1mg= 1000kg.... Hope this information helps. Regards, Nazia Farooqui Heriot Watt University, Scotland.
ppm = parts per million, eg. 1ppm = 1 part out of 1 000 000 = 1/1*106ppb = parts per billion, eg. 1ppb = 1 part out of 1 000 000 000 = 1/1*109ppt = parts per trillion, eg. 1ppt = 1 part out of 1 000 000 000 000 = 1/1*1012
The units parts per billion, or ppb, works just like percent, except that instead of being out of 100, it is out of 1,000,000,000 (1 x 109)For instance, if the concentration of a certain molecule is 5 ppb, that means for every billion molecules in the mixture, only five are that one molecule.So to convert ppb to a percent, divide by 1 x 107.You can also use parts per million (ppm), which is out of 1 x 106, or parts per trillion, ppt, which is out of 1 x 1012.