Darwin Potometer
Product Code : JA-PE-5122
The Darwin Potometer (SKU JA-PE-5122) is a glass apparatus used in biology practicals to show that a leafy shoot takes up water as it transpires and to compare the rate of uptake under different conditions. This Darwin potometer for transpiration experiments is built around a glass tube closed with rubber stoppers, the lower stopper bored to take a length of capillary tubing along which the movement of water is read. JaincoLab supplies it to school and college biology laboratories.
Specifications
The Darwin potometer comprises a glass tube whose straight limb is closed at the upper end with a rubber stopper and fitted at the lower end with a bored rubber stopper that takes a length of capillary tubing; tube dimensions, capillary length and any scale or stand are not listed and are confirmed on the quotation.
| Product | Darwin Potometer |
| SKU | JA-PE-5122 |
| Body | Glass tube with a straight limb |
| Upper end | Closed with a rubber stopper |
| Lower end | Bored rubber stopper taking a length of capillary tubing |
| Reading | Movement of water along the capillary tubing |
Uses of the Darwin potometer in transpiration experiments
Biology teachers use the Darwin potometer to demonstrate transpiration: a freshly cut leafy shoot is sealed into the water-filled apparatus, and the distance the water column, or an introduced air bubble, moves along the capillary in a set time gives a measure of the rate at which the shoot takes up water.
- Demonstrating water uptake by a leafy shoot during transpiration
- Comparing uptake in still air, moving air, light and shade
- Comparing shoots with different leaf areas or with leaves partly covered
- Practical work on plant water relations in school and college biology
Scope of supply and ordering
The listing covers one Darwin potometer consisting of the glass tube, the rubber stopper for the upper end and the bored rubber stopper with its length of capillary tubing, as described in the specification above and ready to be filled with water for a class practical. The plant shoot and any stand, clamp or scale are not part of the listed data. Accessories, spares and quantities are confirmed on the quotation.
Minimum order quantity, lead time and packing for the Darwin potometer are confirmed on each quotation according to the number of sets and the delivery destination, and JaincoLab supplies single sets for a biology lab, class sets for schools and colleges, and bulk or export orders for education projects in Africa, the Middle East and South and South-East Asia.
Frequently asked questions
What does the Darwin potometer measure?
It shows the rate at which a leafy shoot takes up water, read from the movement of water along the capillary tubing, which is used as a measure of transpiration.
What parts make up the apparatus?
A glass tube closed at the upper end with a rubber stopper, and a bored rubber stopper at the lower end that takes a length of capillary tubing.
Is a stand or scale supplied?
A stand, clamp or scale is not part of the listed data; mention it in your enquiry and it is confirmed on the quotation.
Related products
Browse more plant physiology apparatus in the JaincoLab biology lab equipment range, or see the pharmacology lab equipment section.
Request a quote
To order the Darwin Potometer, send the quantity and delivery destination through the JaincoLab contact page or email [email protected]. Buying under a laboratory tender? Use our tenders page.
