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.
Cohesion: Water is attracted to water. Adhesion: Water is attracted to other substances. Adhesion and cohesion are water properties that affect every water molecule on earth and also the interaction of water molecules with molecules of other substances.Essentially, cohesion and adhesion are the stickiness that water molecules have for each other and for other substances.You can see this in the picture to the right. The water drop is composed of water molecules that like to stick together, an example of the property of cohesion.ssentially, cohesion and adhesion are the stickiness that water molecules have for each other and for other substances. You can see this in the picture to the right.