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Define water potential and solute potent...

Define water potential and solute potential.

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Water potential : Water potential is a potential energy of water. That is a free energy lies in unit volume of water. The water potential (`Psi_W`) of pure water at (`JM^(-3)`) atmospheric pressure is zero. The unit of water potential is Bar or pascal (1 mPa = 10 bars).
Solute potential Soluble salts are added so water potential of water decreases (negative) so concentration of water decreases. Water potential of solution is less than water. Thus water potential of solvent decreases. It is called solute potential or `Psi_S` .
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KUMAR PRAKASHAN-TRANSPORT IN PLANTS -Section-E NCERT Exemplar (Very Short Answer)
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  9. Define water potential and solute potential.

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  10. Why is solute potential always negative ? Explain PsiW=PsiS+Psip.

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