Question

Which of the following measurement is equivalent to 100 ppb?

• A. 1 ppm
• B. 10 mg/L
• C. 0.1 ppm
• D. 1 mg/L

Hint:

To convert ppb to ppm, divide by 1000. Always remember: 1 ppm = 1000 ppb.

Answer 1

The Correct Option is C

100 ppb (parts per billion) is equal to 0.1 ppm (parts per million), since: \[ 1 \, \text{ppm} = 1000 \, \text{ppb} \quad \Rightarrow \quad 100 \, \text{ppb} = \frac{100}{1000} = 0.1 \, \text{ppm} \] Hence, 100 ppb = 0.1 ppm.