The process of removing ions (electrically charged particles) from a liquid, especially water, to make it pure.
From the prefix 'de-' (remove) and 'ionization,' which comes from Greek 'ion' (going), referring to the process of removing charged particles that are 'going' through the water.
Deionization is how scientists create ultrapure water for laboratories—water so clean that it's actually slightly acidic because it's literally missing the tiny charged particles that normally stabilize it.
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