Below are typical values of resistivity for various samples of water. Suggest reasons for the wide variation in values.

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter29: Solid-state Electronics
Section: Chapter Questions
Problem 53A
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Below are typical values of resistivity for various samples of water. Suggest reasons for the
wide variation in values.
Sample
Resistivity (2m)
Pure water
2x107
Distilled water
5x105
Rainwater
2x104
Tap water
100-5000
Sea water
30
Transcribed Image Text:Below are typical values of resistivity for various samples of water. Suggest reasons for the wide variation in values. Sample Resistivity (2m) Pure water 2x107 Distilled water 5x105 Rainwater 2x104 Tap water 100-5000 Sea water 30
Expert Solution
Step 1

Conductivity is inversely proportional to the resistivity,

we know, 

                                                         conductivity(σ)=1ρ

           where,    ρ=resistivity

The presence of salt in water increases its conductivity. So, less will be resistivity. We know salt water can conduct current more than normal water due to electrolytic conductivity

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