Nanotechnology is a subject of research and innovation concerned with building 'things' - generally, materials and devices - on the size of atoms and molecules. A nanometre is one-billionth of a metre: ten instances the diameter of a hydrogen atom. The diameter of a human hair is, on average, 80,000 nanometres. At such scales, the normal regulations of physics and chemistry now not apply. For instance, materials' characteristics, consisting of their colour, strength, conductivity and reactivity, can differ appreciably between the nanoscale and the macro. Carbon 'nanotubes' are 100 instances stronger than steel however six instances lighter. It is a pretty multidisciplinary discipline, drawing from fields inclusive of carried out physics, substances technological know-how, colloidal technological know-how, device physics, supramolecular chemistry, and even mechanical and electrical engineering. Much hypothesis exists as to what new science and technology may end result from these traces of research. Nanotechnology may be visible as an extension of present sciences into the nanoscale, or as a recasting of present sciences using a newer, more modern term. Two main methods are utilized in nanotechnology.