In the meantime, a new system of weights and measures, developed by French scientists following the Revolution of 1789, gained increasing international use. This metric system had as its fundamental ...

While most of the rest of the world uses the metric system (formally known as the International System of Units, or SI), the United States uses the U.S. Customary System, which—fun fact—is ...

The rest of the international neighborhood works together ... terms of what is often called the Imperial, or English, system but which metric advocates derisively refer to as FFU (Fred Flintstone ...

Save guides, add subjects and pick up where you left off with your BBC account. The metric system is used to measure the length, mass or capacity of an object. Length is measured in millimetres ...

A nanometer (nm) is a unit of length in the metric system, defined as one billionth (10-9) of a meter (m). The meter is the base unit of length in the International System of Units (SI), making the ...