Other duties of Richmond's City Clerk include assisting the Mayor with appointments, telephone calls and clerical work as needed. Also the City Clerk is the bridge between executive and legislative, between both of these and component government units, and between all of these and the public they are pledged to serve.
A micron is a unit of linear measure in the metric system used to measure distance from one point to another. The particles and contaminants that we are trying to filter out are far smaller than can be seen with the naked eye, magnifying glass or even a low powered microscope.
The picometre is one thousandth of a nanometre, one millionth of a micrometre (also known as a micron), and used to be called micromicron, stigma, or bicron. The symbol ÂµÂµ was once used for it. It is also one hundredth of an angstrom, an internationally recognised (but non-SI) unit of length.