I've been reading a little about this rather new subject (to me), and I'm quite confused. I understand that a colliod is broadly dfined as a substance consisting of a dispersive phase, ie very finely ground gold dust, in a continuous phase, ie water. I'm informed that colliods are especially important for macroscopic measurement of microscopic effects (whatever that means). Could anyone provide an insight, or a good source of information on this topic? I apologise for the lazy post, but as you can see my knowledge is rather limited. I'm a 3rd year physics student and I've never heard of this field of study.