Ganong Potometer Apparatus
Product Code : EL-BLE-10642
Quick answer: The Ganong potometer measures the rate at which a cut plant shoot absorbs water, and so its rate of transpiration, from the movement of an air bubble along a 1 mm bore capillary tube. It is used in plant physiology practicals to compare water uptake under different external conditions. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Part | Specification |
|---|---|
| Capillary bore | 1 mm |
| Base | Varnished wood, with spring clips holding the glassware |
| Shoot mounting | Shoot sealed into a stopper that fits the end tube |
| Bubble reset | Glass stopcock admits water from the reservoir |
| Measurement | Open end of the capillary dips into a beaker of water |
For overall dimensions, email [email protected] with the house code.
How the Ganong potometer experiment is done
The Ganong potometer works on the same principle as other potometers but is built for repeated readings. A leafy shoot, sealed into the stopper at the end tube, draws water from the apparatus as it transpires. The open end of the capillary dips into a beaker of water, so once an air bubble has been introduced it travels along the 1 mm bore as the shoot takes up water. The rate of travel shows the rate of absorption, which closely follows the rate of transpiration.
- Fill the apparatus with water and seal a freshly cut shoot into the stopper at the end tube.
- Dip the open end of the capillary into a beaker of water, then lift it out briefly to let in an air bubble.
- Measure how far the bubble travels along the capillary in a fixed time.
- Open the glass stopcock to admit water from the reservoir and push the bubble back to the start.
- Repeat under changed conditions, such as moving air, bright light or shade, and compare the rates.
Faster bubble movement in moving air or bright light, and slower movement in still, humid air, show students how external conditions control transpiration.
Key features
- 1 mm bore capillary gives a clear, measurable bubble movement
- Glass stopcock and reservoir reset the bubble without dismantling the set-up
- Stopper on the end tube holds the shoot in an airtight seal
- Varnished wooden base with spring clips securing the glassware
- Suited to comparing water absorption under several external conditions in one practical
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Ganong potometer at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
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The full range is in the Biology Lab Equipment section of the Biology Lab range.
Frequently asked questions
What does the Ganong potometer measure?
The rate of water absorption by a cut plant shoot, which is used to study the rate of transpiration under different external conditions.
What is the capillary bore of the Ganong potometer?
1 mm.
How is the air bubble brought back to the start?
The glass stopcock is opened to let water from the reservoir into the tube, which pushes the bubble back.
What is the price of the Ganong potometer?
Prices are not published on the website. Add the Ganong potometer to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-BLE-10642 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Ganong potometer?
Yes. Lab Exports manufactures the Ganong potometer at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-BLE-10642.
Request a quote
Email [email protected] with the house code EL-BLE-10642 and the quantity, or add the Ganong potometer to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
