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Transpiration rates
Environmental factors affecting transpiration rate:

TEMPERATURE
Heat energy can provide the latent heat of vaporisation of water, causing an increase in rate
of evaporation of water from water from the mesophyll cells.

Heat energy will also increase the random thermal movement of molecules in the water
vapour inside…

Page 2

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Measuring transpiration rates
Place a potometer in a bowl of water so it is covered (prevent air bubbles appearing)
Then using a syringe; pull water into the capillary tube (cohesion tension): irradiating
air bubbles.
Take a sample of the plant and place in water (cutting the end of the stem…

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