A nanometer (nm) is a unit of length in the metric system, defined as one billionth (10-9 ... nanometer a derived unit used primarily to measure the atomic and molecular scale of materials and the ...

Objects can be measured in different units, depending on their size. It is important to know the conversions between metric units ... has two dimensions, the length and the width.

or among units of length, volume and weight. In other words, the French introduced not only national standards, but a system of standards. It survives today as the metric system.