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What is the purest form of water?

The purest form of water would be where every molecule in the given container is 2 parts Hydrogen and one part Oxygen.

Rainwater is considered one of the purest forms of water because it is essentially the process of distillation used in laboratories to generate high purity water. However, Rainwater does contain traces of minerals, dust, pollutants from the atmosphere etc., But for all practical purposes, Rainwater is one of the purest forms of water.

However 100% pure water is close to impossible to create. Just the way 100% pure vaccum or 100% pure gold. There are bound to be contaminants at the most microscopic level. The contaminants are usually measured as ppm (Parts Per Million).

The permissible limit varies from country to country depending upon the standards of living but 500 ppm or less of dissolved solids can be considered pretty pure.

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