Which notation represents one part per billion?

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Multiple Choice

Which notation represents one part per billion?

Explanation:
One part per billion means one unit in a billion units, which is 1/1,000,000,000. In scientific notation that’s 1×10^−9, so the notation 1.0×10^−9 matches ppb. The other options represent different tiny scales: 1×10^−6 is one part per million, 1×10^−12 is one part per trillion, and 1×10^−3 is one part per thousand.

One part per billion means one unit in a billion units, which is 1/1,000,000,000. In scientific notation that’s 1×10^−9, so the notation 1.0×10^−9 matches ppb. The other options represent different tiny scales: 1×10^−6 is one part per million, 1×10^−12 is one part per trillion, and 1×10^−3 is one part per thousand.

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