ppm and ppb

This one is courtesy of our friends at the American Chemistry Council

A part-per-million can be thought of as:

  • A credit card lying in the middle of a football field
  • One step, on a 568–mile (914 km) walk
  • One minute, in a two-year span

A part-per-billion can be thought of as:

  • One thousand times smaller than that credit card on the football field
  • One heartbeat in 27 years for an average male (70 heartbeats per minute)
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