Reference Terms
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Triboelectric effect

The triboelectric effect is a type of contact electrification in which certain materials become electrically charged after coming into contact with another different material, and are then separated.

The polarity and strength of the charges produced differ according to the materials, surface roughness, temperature, strain, and other properties.

It is therefore not very predictable, and only broad generalizations can be made.

Amber, for example, can acquire an electric charge by contact and separation (respectively friction) with a material like wool.

Note:   The above text is excerpted from the Wikipedia article "Triboelectric effect", which has been released under the GNU Free Documentation License.
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