Gel & Foam

A mixture where one substance is mixed evenly into
another substance is called a colloid, but the particles of
the mixed substance are only suspended in the mixture.
In most solutions, the particles are completely dissolved
within the solution - like in sugar, but with a colloid the
particles are larger than those particles of the solution it is
mixed with, but are still small enough to be mixed into it
without changing the appearance. The solution looks like
a normal liquid solution. The particles are large enough to
scatter light and not dissolve. This is why some colloids
have the appearance of solutions.
A colloid is a state between a suspension and a solution.
Examples of colloids are:
 Gel: such as jelly, starch, jam,
butter, shoe polish.
 Foam: such as drink froth, soap
froth, whipped cream.