3 ms·Good thing there are 3*10^21 atoms of H2O in a water dropby daedrdev 10mo agoGood thing there are 3*10^21 atoms of H2O in a water dropdeleted 10mo ago[deleted]wagwang 10mo agoOk and there are around that many atoms of pfas per tear drop?Aloisius 10mo agoPFAS are expressed as a mass fraction, not mole fraction.