Water potential quantifies the tendency of water to move from one part to the other during various cellular processes due to kinetic energy possessed by water molecules.
Pure water has the highest concentration of water molecules.
The water potential of pure water is always taken as zero at standard temperature and pressure.
When water is in liquid form, the movement of its molecules is rapid and constant.
Therefore, it has the highest water potential.
The water potential of pure water decreases by adding solute to water.