0.5% by weight equals how many parts per million (ppm)?

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Multiple Choice

0.5% by weight equals how many parts per million (ppm)?

Parts per million is a way to express very small concentrations. To convert from percent to ppm, use the fact that 1% equals 10,000 ppm. Therefore, 0.5% is half of that, giving 5,000 ppm. In other terms, (0.5/100) × 1,000,000 = 5,000. So 0.5% by weight equals 5,000 ppm. For quick reference, 0.1% is 1,000 ppm, 0.25% is 2,500 ppm, and 0.4% is 4,000 ppm.

Parts per million is a way to express very small concentrations. To convert from percent to ppm, use the fact that 1% equals 10,000 ppm. Therefore, 0.5% is half of that, giving 5,000 ppm. In other terms, (0.5/100) × 1,000,000 = 5,000.

So 0.5% by weight equals 5,000 ppm. For quick reference, 0.1% is 1,000 ppm, 0.25% is 2,500 ppm, and 0.4% is 4,000 ppm.

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