Answer:
Answer Water potential is the potential energy of water relative
to pure free water (e.g., deionised water). It quantifies the tendency of water
to move from one area to another due to osmosis, gravity, mechanical pressure
or matrix effects including surface tension. Water potential is measured in
units of pressure and is commonly represented by the Greek letter 
(psi).
This concept has proved especially useful in understanding water movement
within plants, animals and soil. Water potential of a cell is affected by both
solute and pressure potential. The relationship between them is as follows
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