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Significant figures of a number in positional notation are digits in the number that are reliable and absolutely necessary to indicate the quantity of something.
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Parts per million
- Parts per million can be defined as the ratio of number of parts of the component to the total number of parts of all components of the solution multiplied by 106.
- It is denoted by ppm.
- It is used to express concentration of a solution where solute is present in trace For instance, concentration of pollutants in water or atmosphere is expressed in terms of g mL–1 or ppm.
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