Explain parts per million in brief.

Explanation

When a solute is present in trace quantities, it is convenient to express concentration in parts per million (ppm)
Parts per million `= ("Number of parts of the component")/("Total number of parts of all components of the solution")xx10^(6)`
As in the case of percentage, concentration in parts per million can also be expressed as mass to mass, volume to volume and mass to volume.
A litre of seas water (which weights 1030 g) contains about `6xx10^(-3)` g of dissolved oxygen `(O_(2))`. Such a small concentration is also expressed as 5.8 g per `10^(6)` g (5.8 ppm) of seawater. The concentration of pollutants in water or atmosphere is often expresed in terms of `mu g mL^(-1)` or ppm.