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Definitions
Nano-objects (particles, fibers, plates, tubes,...) are entities with at least one dimension is smaller than 100 nanometers. These entities are the basis for the formation of nano-structured materials on the surface or in volume. They are passive or active as nanodevices. This website deals the risks associated with nanomaterials without covering the wider field of nanotechnologies.
Cartoons Episode 1
From the Earth to an orange, from an orange to a nanoparticle.
A nanometer is 10 times oxygen molecule dimension or a billion fraction of a meter. The relative proportion between the Earth and an orange, and the relative proportion between the orange and a nanoparticle are the same order of magnitude.