Dear experts please explain...

Dear student
The above paragraph tells about potometers. Potometers are basically devices that are used to measure rate of transpiration ( evaporation of water from the exposed surfaces of plant, especially leaves )  by different methods and ways. Each potometer has a different method like- Darwin,s potometer finds out the suction force created by transpiration etc.
If you have more specific queries about this then post it as a different question.
Hope this helps!

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