Potometer- investigating the factors that affect transpiration

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  • Created by: Ellie
  • Created on: 31-05-13 13:00

How you would investigate the factors that affect transpiration


A potometer can measure the amount of water lost from a leafy shoot by monitoring the following variables:

·         by measuring the change in the mass of the leaf shoot

·         by recording the rate that the air bubble moves along the narrow tube as the leafy shoot sucks up water to replace the water lost by the transpirations of the plant

How to use photometer:

·         set up the conditions of the experiment e.g. light, wind, humidity

·         let the bubble reach a zero point in the tube

·         measure the movement of the bubble at regular intervals



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