0.009% lead content is equivalent to how many parts per million (ppm)?

0.009% lead content is equivalent to how many parts per million (ppm)?

• A. 9 ppm
• B. 900 ppm
• C. 0.9 ppm
• D. 90 ppm

Answer: (D)

Concentrations can be shown as a percent or as parts per million (ppm). A percent means parts per hundred, while ppm means parts per million, so to convert you multiply the percent by 10,000 (or convert to a decimal and multiply by 1,000,000). 0.009% equals 0.009 × 10,000 = 90 ppm. You can also see it by converting to a decimal: 0.009% is 0.00009, and 0.00009 × 1,000,000 equals 90. For reference, 9 ppm corresponds to 0.0009%, 900 ppm to 0.09%, and 0.9 ppm to 0.00009%. The value that matches 0.009% is 90 ppm.

Concentrations can be shown as a percent or as parts per million (ppm). A percent means parts per hundred, while ppm means parts per million, so to convert you multiply the percent by 10,000 (or convert to a decimal and multiply by 1,000,000).

0.009% equals 0.009 × 10,000 = 90 ppm. You can also see it by converting to a decimal: 0.009% is 0.00009, and 0.00009 × 1,000,000 equals 90.

For reference, 9 ppm corresponds to 0.0009%, 900 ppm to 0.09%, and 0.9 ppm to 0.00009%. The value that matches 0.009% is 90 ppm.