1 [NEW!] Sports vocabulary : Words for popular American sports. [ 2 NEW!] Air Travel: Useful words for traveling on airplanes and through airports. 3  The Environment: Vocabulary related to environmental science and climate change.  Family members: Relatives and other important people.
diffusion coefficient see diffusion coefficient. coefficient of digestibility the proportion of a food that is digested compared to what is absorbed, expressed as a percentage. dilution coefficient a number that expresses the effectiveness of a disinfectant for a given organism.
Diffusion [edit]. Diffusion is defined as the net motion of a substance from an area of high concentration to an area of low concentration, 'down a concentration gradient' . Factors which affect diffusion; 1  How steep the concentration gradient is. 2  Concentration gradient is the ratio of molecules on one side of the membrane to the other, many on one side compared to few on the other will result in a faster net rate of diffusion. 3  Temperature.