| Deionized Water |
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Information AboutDeionized Water |
| CATEGORIES ABOUT DEIONIZED WATER | |
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| coolants | |
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Deionized water is similar to Distilled Water , in that it is useful for Scientific Experiment s where the presence of impurities may be undesirable. The lack of ions also cause the water's Resistivity to increase. Ultra-pure deionized water can have a theoretical maximum resistivity up to 18.3 MΩ·cm-1, compared to around 15 kΩ·cm-1 for common tap water. Deionized water's high resistivity allows it, in some very highly speciallized instances, to be used as a coolant in direct contact with high-voltage electrical equipment. Because of it's high relative Dielectric Constant (~80), it is also used (for short durations) as a high voltage dielectric in many Pulsed Power applications, such as Sandia's Z Machine . Deionized water easily changes PH while storing it. This is because carbon dioxide from the air dissolves in the water and causes a drop in pH by forming Carbonic Acid H2CO3. Boiling the water will remove the carbon dioxide to restore the pH. The uses of ultrapure deionized water are many and varied, often having application in scientific experimentation such as when very pure chemical reaget solutions are needed in a chemical reaction or when a biological growth medium needs to be sterile and very pure. DI water is also used extensively in the semiconductor industry to process and clean Silicon Wafers and sometimes in the optics industry when very highly clean optical surfaces are required for coating. DI water is also often used as a final rinse when washing scientific glassware. Deionized water is very often used as an "ingredient" in many cosmetics and pharmaceuticals where it is sometimes referred to as "aqua" on product ingredient labels. This use again owes to its lack of potential for causing undesired chemical reactions due to impurities. A recent use of DI water is that of a final rinse in some Car Wash es where because it contains so little dissolved solutes, the car dries without leaving any spots. SEE ALSO EXTERNAL LINK
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