Question

What is ppm (parts per million)?

Answer 1

The solution is a mixture of solute and solvent. The solute dissolves in the solvent and the ppm is abbreviated as parts per million. It is defined as the one milligram dissolved in the solvent of one million. It is a very small value and can be used to express a very small value.

Complete answer:
The solution is a homogeneous mixture of solute and solvent. The solute will be present in less amount of quantity and the solvent will be present in a higher amount of quantity.
The concentration can be expressed as parts per million. The shorthand notation will be ppm. It is abbreviated as parts per million.
It is defined as the one milligram dissolved in one million parts. One million is equal to ten lakhs. Thus, one million has the value of $1000000$.
Thus, $1ppm = {10^{ - 6}}$
The parts per million is a unit used to express a very small or a very dilute concentration level. The diluted solutions will have very low concentrations and can be expressed in ppm.
Thus, parts per million is a notation used to express the low concentrations that cannot be expressed in the whole number. The value of one ppm is very low and equal to one part in one million.

Note:
Parts per million has the subunits like parts per million volume and parts per million weight. The parts per million weight is a parts per million weight, used for expression of weights as milligrams per kilogram. Parts per volume is expressed as millilitres per cubic meter.