I thought that I said that
I just want him to be able to sensibly cope with a table view where the beat ratio is listed as 2,10,20, etc. and where he'll see resultant particle sizes ...which if you attempted to integrate it into a BX= would wrongly look like this:
Beta2=6
So even if he "thinks" that's what he's looking at ..he'll know that there isn't (TYPICALLY) any such thing as a 5/6 or 83% efficiency for a 2um particle level of filtration.
Looking at the table
here one could assemble Beta 2,10,10 = X% all listed vertically.
Beta10=10 works
Beta2=10 works
Beta10=2 works
but
Beta17=20 could only work one way
so ..if you incorrectly put Beta20=17 together in your head ..you should, with the knowledge that that would most likely HAVE to mean a 95% efficiency level @ 17um and greater. The particle size will always be the oddball ..if there is an oddball.
It's just a simple way to remember it for someone who doesn't deal with it enough to bother cementing it in their head. In the scheme of life skills ..this can all fall into "did he shoot 6 times or only 5
".
For example, Wix posts
Beta ratio 2/20 = 12/42
Anyone could integrate that to
beta2=12
beta20=42
by just knowing that efficiency ratings fall into a stable format ..while particles do not ..you can figure it out without being "techically correct".
