Why is it important to check the conductivity and ph of pure water for comparison

To check that underlying conditions are stable of the water source, checking for the purity of the water (conductivity highlights levels of impurities), and pH determines the alkalinity or acidity of water. 

Cause its being chemically applied?

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic