It is also equivalent to one part per billion (ppb). One ppb is 1,000 times a part per million. Concentrations measured in ppm and ppb are so small that they can be difficult to conceptualize.

Carbon dioxide reached 422 ppm (parts per million), up 2.9 ppm from 2023. Methane reached 1897 ppb (parts per billion), a 3 ppb increase from the previous year. | Photo Credit: RAO GN In a bid to ...

The M500 TOC analyzer enables simultaneous measurements of conductivity and has an operating range of 0.03 ppb to 2.5 ppm with excellent accuracy. The new model increases analysis speed by as much as ...