Question

What is particel fraction​

Answer 1

i think u have made some mistake in question. it is particle fraction.The fine particle fraction (FPF) is the fraction of emitted particles that are less than a particle size that is considered the upper limit of respirable. Some say this is 5 micron, some use 3.5 micron MMAD. The lower number appears to have better correlation with in vivo deposition.

Answer 2

$\huge\boxed{Answer}$

The fine particle fraction (FPF) is the fraction of emitted particles that are less than a particle size that is considered the upper limit of respirable. Some say this is 5 micron, some use 3.5 micron MMAD. The lower number appears to have better correlation with in vivo deposition