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>
> Well, I've found tables and other neat data about dissimilar metals. But
> nowhere do I find what I need most:
>
> How much is too much difference in electromotive force measurements? Is it
> anything over 1 volt?
More likely anything over 0.1 V (in some cases 0.05 V would be
too much), but it depends on the situation.
What is your application? What two metals would be in contact?
Are one or both of the metal surfaces passivated? What environment
would the metal couple be exposed to? What are the relative surface
areas of the two metals? I assume air is available.
--
Karen Tellefsen
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