Potometer Apparatus White Stand
Product Code : EL-BLE-10641
Quick answer: The potometer apparatus measures how fast a small leafy shoot takes up water, which is used as a measure of its rate of transpiration. It is used in biology practicals to compare transpiration under different conditions. The apparatus is mounted on a backing plate, measures 195 x 150 x 75 mm and has only one glass part, the capillary tube. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Item | Specification |
|---|---|
| Dimensions | 195 x 150 x 75 mm |
| Glass parts | One: the capillary tube |
| Mounting | Strong backing plate |
| Zeroing | Syringe used to zero the scale |
| Additional use | Measures humidity when connected to a porous pot |
How the potometer experiment is done
Almost all the water a leafy shoot absorbs is lost again by transpiration, mostly through the stomata. A potometer measures the water taken up by a cut shoot: as the shoot draws water in, an air bubble in the capillary tube moves along, and the distance it travels in a set time gives the rate. Because the plant keeps only a small fraction of the water, the rate of uptake is a good estimate of the rate of transpiration.
- Cut a small leafy shoot under water so that no air enters the xylem.
- Fit the shoot into the apparatus under water so that the joint is airtight, and fill the system with water.
- Let a small air bubble into the capillary tube and use the syringe to set it at zero on the scale.
- Record how far the bubble moves in a fixed time, then reset it with the syringe and repeat.
- Change one condition, such as air movement, light or temperature, and compare the rates.
Transpiration is usually faster in moving air, bright light and warm, dry conditions. With a porous pot connected in place of the shoot, the apparatus measures evaporation from the pot, which indicates the humidity of the air.
Key features
- Only one glass component, the capillary tube, which reduces breakage in student use
- Bubble movement in the capillary shows water uptake directly
- Syringe for zeroing the scale between readings
- Strong backing plate keeps the apparatus rigid on the bench
- Compact 195 x 150 x 75 mm size
- Can also measure humidity when connected to a porous pot
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 potometer apparatus 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 a potometer measure?
The rate at which a cut leafy shoot takes up water, which is used as an estimate of its rate of transpiration.
How is the potometer reset between readings?
The syringe is used to move the air bubble back to zero on the scale.
Can the potometer measure humidity?
Yes. When it is connected to a porous pot instead of a shoot, it measures evaporation, which indicates the humidity of the air.
What is the price of the potometer apparatus?
Prices are not published on the website. Add the potometer apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-BLE-10641 and the quantity, to receive a quotation.
Does Lab Exports manufacture the potometer apparatus?
Yes. Lab Exports manufactures the potometer apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-BLE-10641.
Request a quote
Email [email protected] with the house code EL-BLE-10641 and the quantity, or add the potometer apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
