The agar cubes before the addition of vinegar looked pink in color due to the addition of coloring agent for testing color change on addition of vinegar.
When vinegar is added the color of agar changes from pink to orange as vinegar is acidic in nature.
Also as the vinegar diffused into the cubes it became large after stirring. Thus, both the size and color of vinegar cubes changed.
The vinegar would tend to diffuse into the agar blocks decreasing the amount of vinegar outside the agar cubes and increasing the volume of agar cubes. Diffusion<span> is the movement of particles (ions or molecules) from an area of higher concentration to an area of lower concentration.
