2.4 nanoparticles

• SA : V ratio = l x l x 6 / l x l x l
• SA : V ratio = 6 / l
• The surface area to volume ratio is the ratio of the total surface area of an object to its volume.
• nanoparticles have a high SA : V ratio.
• if the size of a cube halves, the SA : V ratio doubles.
• nanoparticles have a diameter of 1-100 nm.
• nanoparticles contain a few hundred atoms.
• nanoparticles have a large surface area to volume ratio, so they make good catalysts.
• nanotubes can be used to make stronger, lighter building materials.
• nanoparticles are used in cosmetics such as sun cream and deodorant because they leave no white marks.