A system of weights and measures that uses the gram, meter and liter as its primary units of weight, distance and capacity. The metric system is the primary standard used all over the world except ...

Save guides, add subjects and pick up where you left off with your BBC account. Units from the metric system can be used to describe the mass, volume or length of an object. Mass is measured in ...

A radical initiative for its time, the Metre Convention ultimately birthed a system of measurement that would transcend language, politics and tradition, and lay the foundation for a new global era of ...

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 ...

A nanosecond (ns) is a unit of time in the metric system, equal to one billionth (10-9) of a second (s). The second is the base unit of time in the International System of Units (SI), making the ...

Save guides, add subjects and pick up where you left off with your BBC account. Units from the metric system can be used to describe the mass, volume or length of an object. Mass is measured in ...