The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm), or nanometer (American spelling), is a unit of length in the International System of Units (SI), equal to one billionth (short scale) or one thousand million (long scale) of a meter (0.000000001 m) and to 1000 picometres.

The nanometre (SI symbol: nm) is a unit of length in the metric system equal to 10 −9 metres (⁠ 1 / 1 000 000 000 ⁠ m = 0. 000 000 001 m). To help compare different orders of magnitude , this section lists lengths between 10 −9 and 10 −8 m (1 nm and 10 nm).

The nanometre (symbol: nm) is a unit used to measure length in the metric system. It is equal to one billionth of a metre (1 m / 1,000,000,000) and for kilometre, it is equal to one trillionth of a kilometre (1 km / 1,000,000,000,000).

Le nanomètre, de symbole nm, est une unité de longueur du Système international. C'est un sous-multiple du mètre, il vaut un milliardième de mètre : 1 nm = 10 –9 m (donc aussi 10 –6 mm ou 10 −3 µm). Un nanomètre équivaut à 10 ångströms a : 1 nm = 10 Å.

The term combines the SI prefix nano-indicating a 1 billionth submultiple of an SI unit (e.g. nanogram, nanometre, etc.) and second, the primary unit of time in the SI. A nanosecond is to one second, as one second is to approximately 31.69 years.

A nanometre is a measurement – it is clearly defined as a billionth of a metre. On the other hand, although nanoscale is a scientific term, it means different things to different people. Many nanoparticles are ball-shaped, so all dimensions are small.

One nanometre (nm) is 10 −9 metre. The micrometre (μm), which equals 10 −6 metre, is often used to describe infrared radiation. Read More