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.
21 Apr 12. While it does no harm to shake water, the 'scientific' explanation for doing so which you have been given is complete poppycock! What happens when you shake water is that it aerates it and small bubbles of air become suspended for a time in the water.