How small nanoparticle is?(4-7)
We live in a such world where it's quite impossible for us to imagine and percept a world that's too small to visualize. A nanometer is one billionth (10-9) of a meter, which is very small, only 10 times length of hydrogen atoms, only 1/80,000 the width of a human hair. It's hard to imagine just how small nanotechnology is. One nanometer is a billionth of a meter, or 10-9 of a meter. Some interesting examples will be helpful for the perception of nano scale (Fig 1)
Fig1: Illustration off different objects in nano,micro and millimeter
scale (1 mm= 1000 um,1 um=1000 nm)
>>There are 25,400,000 nanometers in an inch
>>A sheet of newspaper is about 100,000 nanometers thick
>>On a comparative scale, if a marble were a nanometer, then one meter would be the size of the Earth.
>>Human hair: 50,000-100,000 nanometers in diameter.
>>DNA double-helix: ~2 nanometers in diameter.
>>One piece of paper: ~100,000 nanometers thick.
>>Man 6 ft tall ~ 1900 million nanometers tall.
4.Allhoff F, Lin P and Moore D (2010). What is nanotechnology and why does it matter?: from science to ethics. John Wiley and Sons. pp 3-5. "http://en.wikipedia.org/wiki/International_Standard_Book_Number.
"title="International Standard Book Number">ISBN 1-4051-7545-1.
5. Prasad SK (2008). Modern Concepts in Nanotechnology. Discovery Publishing House. pp. 31-32. ISBN 81-8356-296-5.
6. Kahn J (2006). "Nanotechnology". National Geographic 2006 (June): 98-119.
7.Rodgers P(2006).Nanoelectronics: Single file. Nature Nanotechnology.doi:10.1038/nnano.2006.5.
1.Nanoparticles are so tiny that we cannot imagine in real world.
2.It is so small that diameter of human hair is around 50,000 nm.