PPB stands for which measurement?

PPB stands for which measurement?

• A. Parts Per Thousand
• B. Parts Per Byte
• C. Parts Per Billion
• D. Parts Per Basis

Answer: (C)

PPB denotes parts per billion, a concentration unit used for trace amounts of a contaminant in environmental samples. It means one part of the substance in one billion parts of the total mixture. Because it expresses such tiny amounts, PPB is commonly used for lead when measuring water, air, or soil quality. For example, 1 PPB roughly corresponds to 1 microgram of contaminant per liter of water (assuming water’s density is about 1 kg/L). So a measurement of 15 PPB would be about 15 µg/L. The other options aren’t standard concentration units for environmental testing: parts per thousand is much larger (0.1%), and parts per basis or parts per byte do not apply to measuring chemical concentrations.

PPB denotes parts per billion, a concentration unit used for trace amounts of a contaminant in environmental samples. It means one part of the substance in one billion parts of the total mixture. Because it expresses such tiny amounts, PPB is commonly used for lead when measuring water, air, or soil quality. For example, 1 PPB roughly corresponds to 1 microgram of contaminant per liter of water (assuming water’s density is about 1 kg/L). So a measurement of 15 PPB would be about 15 µg/L. The other options aren’t standard concentration units for environmental testing: parts per thousand is much larger (0.1%), and parts per basis or parts per byte do not apply to measuring chemical concentrations.