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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
STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.