Soot: Convert ct/ml to Percent

[Jim Allen]

Anyone know how to convert ct/ml to percent? As in certain companies (like Cat) that use this system).

 

[John K]

Could you give an example of some results? I expect it in percentage terms to be much less than 0.01%. There probably is not a good conversion as the size would vary. I am assuming that the ct is abbreviation for count....

 

[Jim Allen]

Well, if you looked at an oil test, it would read 70 but it would be 70/ml. I read one person who said 70/ml was equivalent to 1%. I saw another reference that said 126/ml was .66%.

 

[OldCowboy]

I don't think you can convert count to percent. For instance, if you had 1 ml of oil with a .25 ml particle, you'd have 1/ml but it would represent 25% of the volume.

OTOH, if you had 1 ml of oil with a thousand 5 micron particles you would have an aggregate particle volume of 64450 cubic microns. This is based on a presumption of uniform 5 micron spheres with a volume of 64.45 cubic micron per sphere (V = 4*3.1416*2.5*2.5*2.5/3). 1 ml contains 10^9 cubic microns (1000*1000*1000). So, 1 ml with a thousand 5 micron particles would contain 64450/10^9 = 0.0000064450 percent.

If the particles were 100 microns, the aggregate particle volume would be 5.24x10^8 and the percentage would be 52.4 percent.

So, without knowing the average size of the particles, there is no way of converting count/ml to a percentage.