Question

Resistivity of pure water is​

Answer 1

Explanation:

Resistivity is measured in Ohms. When salts dissolve into water, free ions are created. These ions are able to conduct an electrical current.

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Type of Water Approximate resistivity in Ohms (Ω)

Pure Water 20,000,000

Distilled Water 500,000

Rain Water 20,000

Tap Water 1,000 – 5,000

Answer 2

Answer:

The resistivity of absolute pure water is 18.2 MΩcm at 25°C or 0.055 micro-siemens/cm.

Explanation:

• Resistivity in water means the ability of water to resist an electric current which is directly proportional to the amount of dissolved salt in the water.
• Water having high-concentration of dissolved salts will have low resistivity and similarly water having low-concentration of dissolved salts will have high resistivity.
• The S.I unit of resistivity is Ohms Ω.
• Ultra-Pure Water with none chemical impurities will nevertheless have a conductivity due to the presence of $H^{+}$ and $OH^{-}$ ions because of the self-ionization of water.
• Ultra-natural water has a conductivity of 0.055µSiemens/cm or a resistivity of 18.18 mΩ·cm at 25 °C.

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