Milk is a colloidal solution while vinegar is a true solution.

Colloidal Solution
- A colloidal solution is a mixture where the size of the particles is larger than the size of molecules but smaller than the size of a suspension.
- In a colloidal solution, the particles are dispersed throughout the medium and do not settle down due to gravity.
- Milk is an example of a colloidal solution. It consists of small fat globules dispersed in water.
- The fat globules in milk are larger than individual molecules but smaller than the particles in a suspension. This is what classifies it as a colloidal solution.

True Solution
- A true solution is a homogeneous mixture of two or more substances where the solute particles are very small and do not settle down.
- In a true solution, the solute particles are individual molecules or ions that are uniformly dispersed in the solvent.
- Vinegar is an example of a true solution. It is a mixture of acetic acid and water, where the acetic acid molecules are uniformly dispersed in the water.
- The acetic acid molecules are very small and do not settle down due to gravity, making vinegar a true solution.

Comparison
- Milk is a colloidal solution because it contains larger particles (fat globules) that are dispersed in the liquid medium (water). These particles are too large to be considered true solutions.
- Vinegar, on the other hand, is a true solution because it consists of individual molecules of acetic acid that are uniformly dispersed in water. These molecules are small enough to be considered true solutions.

In summary, milk is a colloidal solution because it contains larger particles (fat globules) dispersed in water, while vinegar is a true solution because it consists of individual molecules of acetic acid uniformly dispersed in water.

In a true solution, the substance dissolved (the solute) has a partical size of less than 10^-9m.a n example would be a simple solution of sugar in a water