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In what units can concentration in parts per million (ppm) be expressed?

Options

  1. AMass to volume only
  2. BMass to mass only
  3. CVolume to volume only
  4. DMass to mass, volume to volume, and mass to volume

Correct answer

D. Mass to mass, volume to volume, and mass to volume

Step-by-step solution

The paragraph mentions that concentration in parts per million (ppm) can be expressed as mass to mass, volume to volume, and mass to volume.

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