How to convert parts-per quadrillion to parts-per million

1 parts-per quadrillion (ppq) is equal to 1×10^-9 parts-per million (ppm). Conversely, 1 parts-per million (ppm) is equal to 1×10^9 parts-per quadrillion (ppq).

Step by step guide to convert parts-per quadrillion to parts-per million

Converting units

Since both units has meters we just need to convert the metric prefix. There is 1,000,000,000 millions to a quadrillion. Thus,

$$1 ppm = 1,000,000,000 ppq = 10^{9} ppq$$

or

$$1 ppq = \frac{1}{1,000,000,000} ppm = 10^{-9} ppm$$

Wikipedia page for parts-per notation