Concentration units are used to express the amount of a substance dissolved in a solution. They are crucial in chemistry, environmental science, and many other fields where precise measurements of substances in mixtures are necessary.
Common Concentration Units
Decimal: A pure fraction, ranging from 0 to 1.
Percent (%): Parts per hundred, ranging from 0% to 100%.
Permille (‰): Parts per thousand.
Parts Per Million (PPM): Parts per 1,000,000.
Parts Per Billion (PPB): Parts per 1,000,000,000.
Parts Per Trillion (PPT): Parts per 1,000,000,000,000.
Conversion Formulas
The general formula for converting between these units is:
\[Output = Input \times ConversionFactor\]
Where ConversionFactor depends on the input and output units:
Decimal to Percent: \(ConversionFactor = 100\)
Decimal to Permille: \(ConversionFactor = 1000\)
Decimal to PPM: \(ConversionFactor = 1,000,000\)
Decimal to PPB: \(ConversionFactor = 1,000,000,000\)
Decimal to PPT: \(ConversionFactor = 1,000,000,000,000\)
Calculation Steps
Convert the input to decimal form (if not already)
Multiply the decimal by the appropriate conversion factor
Round the result to the desired number of decimal places
Example Calculation
Let's convert 5% to PPM:
Convert 5% to decimal: \(5\% = 0.05\)
Multiply by the conversion factor: \(0.05 \times 1,000,000 = 50,000\)
Therefore, 5% is equal to 50,000 PPM.
Visual Representation
This diagram illustrates the conversion of 5% to 50,000 PPM. The colored portions represent the relative concentrations, showing that while the actual amount remains the same, the PPM value is numerically much larger than the percentage.
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