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Transcript 
Water potential
Water potential = solute potential
+ pressure potential
Pressure potential
• A force that resists water
flow due to a container (cell)
being full and not wanting to
expand any more. Cell
walls of plant cells are
important in this regard.
Solute potential
• Solute potential = - i M R T
• i = the number of pieces the solute breaks
into in the water
• R = a constant (.0821)
• T = temperature
• M = concentration of the solution
• NOTE: The negative is important
Negative
• As solute potential is more negative with
increased solute concentration, the water
will move from high to low water potential.
• A high concentration of solute leads to a
more negative (lower) water potential.
Quiz on lab
• http://www.phschool.com/science/biology_
place/biocoach/biomembrane1/induce.htm
l
• http://www.phschool.com/science/biology_
place/labbench/lab1/analysis.html
• http://www.phschool.com/science/biology_
place/labbench/lab1/quiz.html
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