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part per billion
Symbol:  ppb 
Category:  Fraction 
SI Equivalent:  10×10-10 
Dimension nil (fraction) 
System:  INT 
 
Notes
1 ppb = 10-9
Convert     ppb  
1 ppb =
Fraction
  Symbol Unit Name
2.4×10-8  ct, Kt  carat (karat) 
10×10-8  pph, %  part per hundred 
10×10-2  pphm  part per hundred million 
10×10-5  ppht  part per hundred thousand 
10×10-4  ppm  part per million 
10×105  ppq  part per quadrillion 
1000  ppt  part per tera 
10×10-7  ppt  part per thousand 
Glossary