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GCSE Combined Science · key term
An apparatus that measures water uptake by a leafy shoot, allowing transpiration rate to be estimated.
Used by AQA and Edexcel
Specification 4.2.3.2 · Paper 1
Revise: Transpiration rates: environmental factors and dataA bubble potometer measures water uptake by a leafy shoot. As the shoot takes up water, an air bubble moves along a narrow capillary tube. A ruler measures its movement and a timer measures the elapsed time.
Paper 1, Paper 2
Apparatus used to measure water uptake by a plant shoot as an estimate of its transpiration rate.
A bubble potometer measures water uptake, not water loss directly. Bubble speed is an indicator of transpiration rate.
A bubble potometer measures water uptake, not water loss directly. Use this distinction when interpreting its results.
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A bubble potometer connects a leafy shoot to a water-filled capillary tube. As the shoot takes up water, an air bubble moves along the tube. A ruler measures its movement and a timer measures the elapsed time.