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Chapter 21: Q21.79P (page 975)

Why do steel bridge-supports rust at the waterline but not above or below it?

Short Answer

Expert verified

There isn't enough oxygen below the waterline, and there isn't enough water above the waterline for rust to form.

Step by step solution

01

Step 1:

In rust formation, aside from water, oxygen is also needed. Along the waterline, there is abundant oxygen in water.

Below the line, there is not enough oxygen, while above the waterline, there is no water for the rusting to occur.

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