What is water potential ?

Explanation

1. The concept of water potential was introduced in 1960 by Slatyer and Taylor.
2. Water potential is potential energy of water in a system compared to pure water when both temperature and pressure are kept the same.
3. It is also a measure of how freely water molecules can move in a particular environment or system.
4. Water potential is denoted by the Greek symbol `psi` (psi) and measured in Pascal (Pa). At standard temperature the water potential of pure water is zero .