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50 parts per billion' means what?

Updated: 4/28/2022
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15y ago

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Imagine cube of air 1 meter by 1 meter by one meter. There are 5 BBs in the cube. They will fill up about 50 parts per billion (ppb) of the cube's volume.

There are about 7 billion people living on Earth. 350 people, about a typical Facebook friends list, represent 50 ppb of the total population of the world.

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Q: 50 parts per billion' means what?
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