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Vv<br />
Van der Waals forces<br />
The forces of attraction and repulsion between molecules caused by the electric fields of the<br />
electrons (negative) and the nuclei (positive). The forces of molecular attraction explain why<br />
particles adhere to a filter’s fiber.<br />
Vapors<br />
A substance in the gaseous state which is usually in a liquid or solid state.<br />
Virus<br />
A semi-living, generally inert microscopic particle chiefly protein in composition. They<br />
replicate by entering a living cell and direct the cell to reproduce more viruses. The cell is<br />
usually destroyed as the new viruses are released to the surrounding environment.<br />
Viscose fiber<br />
See Rayon Fiber.<br />
<strong>Nonwovens</strong> <strong>Glossary</strong><br />
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