One part per billion is ·1 inch in16,000 miles ·1 second in32 years ·1 cent in10,000,000 1 pinch of salt in 10 tons of potato chips 1 lob in 1,200,000 tennis matches 1 bad apple in 2,000,000 barrels of apples Mistretta USFS R-8 One part per billion is • 1 inch in 16,000 miles • 1 second in 32 years • 1 cent in $10,000,000 • 1 pinch of salt in 10 tons of potato chips • 1 lob in 1,200,000 tennis matches • 1 bad apple in 2,000,000 barrels of apples Mistretta USFS R-8