Nanometer, like centimeter, decimeter and meter, is a unit for measuring length. One nanometer is equal to one billionth of a meter. Putting a nanometer object on a ping-pong ball is like putting a ping-pong ball on the earth.

Experts explained that "nano" means nano, which is usually expressed by "nm". In physics, nanometer is the unit of length; 1 micron is one thousandth of a millimeter, and 1 nanometer is equal to one thousandth of a micron, which is equivalent to one thousandth of a hair. Its conversion relationship with the length unit meter is: 1 nanometer = 10 minus 9 meters. In contrast, if the ratio of 1 m is the diameter of the earth, then 1 nm is about 1 the diameter of glass beads. The so-called "nanotechnology" is a high-tech that studies and utilizes the structure, characteristics and interaction of atoms and molecules on the scale of 0. 1~ 100 nm. "Nano-micromanipulation" is an important content of nanotechnology, and its purpose is to move, shape, depict and assemble nano-materials according to people's wishes on the nano-scale. Nano-micromanipulation began in the 1980s.