The movement of gas molecules or aerosols into liquids, caused by a concentration gradient. When macromolecules and tiny molecules are diffused they provide an important resource for animals, plants and biological matter. The process of diffusion also is important in food processing and in the preservation of solutions and liquid combinations, which include beverages such as coffee, juice, tea, during periods of evaporation. Microorganisms, waste, and products are occasionally diffused away from nutrients, fermentation, oxygen and sugar. Waste products such as creatinine, overabundance of fluids and urea are eliminated from the blood by the kidneys.