How does the concentration of a solution affect the change in mass of a vegetable piece soaked in it? In Year 10 Science, students are investigating osmosis, which is the diffusion of water. Water naturally diffuses from areas of high water concentration to areas of low water concentration. Students measure the initial mass of a vegetable piece, soak it in a solution for thirty minutes, and then weigh the final mass of the vegetable after it has soaked. The change in mass of the vegetable piece determines whether water diffused into, or out of, the vegetable. Other factors that affect this investigation include: initial moisture of the vegetable, solution type, temperature of the solution, and surface area of the vegetable piece.