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1 point

What’s PPM in this context? Like, one drop in a bucket?

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5 points

“Parts-per-million”

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3 points

Ok but what about in this context?

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3 points

1 mg of chlorine per 1 litre of water

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3 points

PPM is an American way of saying mg/L because they’re all allergic to SI units.

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2 points

Thanks! I knew what PPM was, but I was having trouble visualizing how much chlorine was that in, say, a liter of water.

And there you go. 1 mg per liter does the trick, and it’s standard!

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