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part per billion 
Symbol:  ppb 
Category:  Fraction 
SI Equivalent:  1×10-9 
Dimension:  nil (fraction) 
System:  INT 
Notes
1 ppb = 10-9
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Convert     ppb  
1 ppb = 
Fraction
  Symbol Unit Name
2.4×10-8  ct, Kt  carat (karat) 
1×10-7  pph, %  part per hundred 
0.1  pphm  part per hundred million 
1×10-4  ppht  part per hundred thousand 
1×10-3  ppm  part per million 
1×106  ppq  part per quadrillion 
1000  ppt  part per tera 
1×10-6  ppt  part per thousand 
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