Question

definition of
water potential​

Answer 1

Answer:

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Explanation:

Water potential is a measure of potential energy of water or the difference in potential energy between a given water sample and pure water.

Answer 2

Answer:

"The chemical potential of water is expressed in terms of free energy associated with one mole of water."

Explanation:

• Water potential may be defined as the difference in free energy per mole, between pure water and osmotically constrained, metrically bound, or pressurized water at the same temperature and pressure.

• Thus it is the chemical potential of water is expressed in terms of free energy associated with one mole of water.

• Water potential is expressed by a symbol Ψ (Psi, a greek letter). and it is measured in terms of pressure e.g. bars.

• The water potential of pure water at standardized conditions is zero. So when a solute gets dissolved in pure water, its water potential becomes negative because of the decreased free energy. Thus the water potential of all solutions is always less than zero (negative ).

• When pure water is heated the water potential refers to positive as free energy increases.

• A difference or a gradient in water potential between two regions determines the direction of movement of water. Water molecules always diffuse from the region of their high concentration to the region of their low concentration.

• For example,

if a plant cell is immersed in a solution that has a higher water potential than the cell, water will move into the cell.

• The water potential of a solution is often expressed as the sum of its four components i.e. Osmotic potential, Solute potential, pressure potential, and matric potential.