This section considers some of the chemistry behind the colour of dyes and how the target material, for example a fibre, influences the method of dyeing and the dye used. A dye in solution is coloured because of the selective absorption of certain wavelengths of light by specific bonds in the molecule.
Cannot travel in vaccum. Sound is energy and it causes vibration, which travels in a medium. So imagine molecules transfering the energy (vibration) from source toward a particular direction. In water molecules are more rigid than in gas. So vibration is transferred faster.
Despite what most people would think, humans are actually quite well suited to being underwater, as after all, we spend the first 9 months of our lives in an âunderwaterâ environment. If an infant is submerged under water it will instinctively hold its breath for around 40 seconds whilst making swimming motions.