movement across p.m
- down its conc gradient, high to low conc.
- doent need energy.
- diffusion of water, from a more dilute solution to a more conc solution.
- isotonic = w.p to a cell = no diffusion of water
- hypertonic - w.p then a cell = water out of cell
- hypotonic + w.p then a cell = water into cell
- the effective conc of of free water.
- water always falls from high to low w.p
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