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part per million
Symbol:  ppm 
Category:  Fraction 
SI Equivalent:  10×10-7 
Dimension nil (fraction) 
System:  INT 
 
Notes
1 ppm = 10-6
Convert     ppm  
1 ppm =
Fraction
  Symbol Unit Name
2.4×10-5  ct, Kt  carat (karat) 
1000  ppb  part per billion 
1×10-4  pph, %  part per hundred 
100  pphm  part per hundred million 
0.1  ppht  part per hundred thousand 
10×108  ppq  part per quadrillion 
1×106  ppt  part per tera 
10×10-4  ppt  part per thousand 
Glossary