2.54 Transpiration
- for evaporation to occur: water (liquid) ----> water vapour (gas). and for this to occur you need heat. to get this heat we use sunlight
- water is delivered in from leaf by xylem, and from there it moves through the spongy mesophyll layer and then to just above the stomatal pore.
- then the gas water vapour diffuses through the stomatal pore through a fairly steep diffusion gradient, as the water vapour inside the stomatal pore is at 100% humidity and outside the leaf the humidity is less than that and the distance between them is only one cell thick.
the diffusion gradient is important
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