The concentration of water differ by placing the cell in hypotonic, hypertonic or isotonic solution.
Hypertonic solution:
If a cell is placed in a hypertonic soluton, water will leave the cell, and the cell will shrink.
Isotonic solution:
The relative concentration of solute and water are equal on both sides of membrane.
Hypotonic solution:
If cell is placed in a hypotonic solution, water will enter the cell and cell would swell.