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

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Multiple Choice

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

Explanation:
Converting percent to parts per million uses the same idea of “per one million” versus “per one hundred.” Since 1% equals 1 part per 100, multiplying by 10,000 gives the ppm value because 1% is 0.01 and 0.01 × 1,000,000 = 10,000. So 0.5% is 0.5 × 10,000 = 5,000 ppm. In other words, 0.5% corresponds to 5,000 parts per million. The other numbers would map to different percentages: 500 ppm is 0.05%, 50 ppm is 0.005%, and 50,000 ppm is 5%.

Converting percent to parts per million uses the same idea of “per one million” versus “per one hundred.” Since 1% equals 1 part per 100, multiplying by 10,000 gives the ppm value because 1% is 0.01 and 0.01 × 1,000,000 = 10,000. So 0.5% is 0.5 × 10,000 = 5,000 ppm. In other words, 0.5% corresponds to 5,000 parts per million. The other numbers would map to different percentages: 500 ppm is 0.05%, 50 ppm is 0.005%, and 50,000 ppm is 5%.

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