CDPH Lead Inspector/Assessor California State Practice Exam

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How many parts per million is 1%?

1,000 ppm
10,000 ppm
100 ppm
1,000,000 ppm

The correct answer is: 10,000 ppm

To understand how many parts per million (ppm) are equivalent to 1%, it's essential to first grasp the definition of percentage and ppm. A percentage is a way to express a number as a fraction of 100. Therefore, 1% means 1 part out of every 100 parts. When converting percentages to parts per million, we recognize that 1 ppm corresponds to 1 part in 1,000,000 parts. To find out how many ppm are in 1%, we can perform the following calculation: 1% equals 1 part in 100 parts, which can be expressed as: 1% = 1/100. To convert this to ppm: 1/100 can be converted to ppm by multiplying by 1,000,000: (1/100) * 1,000,000 = 10,000 ppm. This means that 1% concentration is equivalent to 10,000 ppm. Thus, the answer is correct, as 10,000 ppm accurately represents 1%. Understanding this conversion is vital in contexts related to environmental science and public health, especially concerning lead exposure assessments and regulations where ppm is a common measurement unit.