What does ER stand for?

Effective Roughness

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Samples in periodicals archive:

The surface roughness derived was the effective roughness from a ratio of current density on the top and the bottom of the conductor because the top and bottom surface roughness was different.

Low-loss fluoropolymer copper clad laminate: improved evaluation ...

In addition, they indicate that the order of magnitude values of bed and composite effective roughness heights of 0.

Hydrodynamic and physical assessment of ice-covered conditions for ...