The term colloid describes a system consisting of one substance finely dispersed in another, normally a solvent. The size of particles found in a colloidal dispersion range between 1 and 1000 ...

And speaking of the earth, over 70% of the earth’s surface is water! Find out more with this selection of water-related educational resources from the American Chemical Society.

This can be visualised by considering the specific example of surfactant molecules at the air-water surface, shown in the figure right. The polar hydrophilic heads remain solvated in polar water ...