1. What is Water Conductivity To Resistivity Conversion?

The conversion between conductivity (σ) and resistivity (ρ) is a fundamental relationship in water quality analysis. Resistivity is the reciprocal of conductivity, representing water's ability to resist electrical current flow.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( \rho \) — Resistivity (Ω·m)
• \( \sigma \) — Conductivity (S/m)

Explanation: This inverse relationship means that as conductivity increases, resistivity decreases, and vice versa.

3. Importance of Resistivity Calculation

Details: Resistivity measurement is crucial in water purity assessment, particularly in pharmaceutical, semiconductor, and laboratory applications where high-purity water is required.

4. Using the Calculator

Tips: Enter conductivity value in Siemens per meter (S/m). The value must be greater than zero. The calculator will automatically compute the corresponding resistivity.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical resistivity of ultrapure water?
A: Ultrapure water can have resistivity values up to 18.2 MΩ·cm (0.182 MΩ·m) at 25°C.

Q2: How does temperature affect conductivity and resistivity?
A: Both parameters are temperature-dependent. Conductivity increases with temperature while resistivity decreases. Measurements are often normalized to 25°C.

Q3: What units are commonly used for water resistivity?
A: While SI units are Ω·m, water resistivity is often reported in Ω·cm or MΩ·cm (1 MΩ·cm = 10,000 Ω·m).

Q4: Why is high resistivity important in certain applications?
A: High resistivity indicates low ion concentration, which is critical in processes where ionic contamination could affect product quality or research results.

Q5: Can this calculator be used for seawater?
A: Yes, but note that seawater has very high conductivity (low resistivity) due to its high salt content.