What is the spread of a drop of food dye throughout a glass of milk?

The spread of a drop of food dye in a glass of milk demonstrates diffusion, where the dye molecules move from an area of higher concentration to areas of lower concentration. Initially, the drop appears as a concentrated spot, but over time, it disperses throughout the milk due to the random motion of molecules. The presence of fat and protein in the milk can also influence the diffusion rate and pattern, leading to swirling and intricate designs before it eventually becomes uniformly mixed. This process visually showcases the principles of fluid dynamics and molecular interaction.