Editing Solar still (section)

=== Transpiration ===
During photosynthesis plants release water through [[transpiration]]. Water can be obtained by enclosing a leafy tree branch in clear plastic,<ref>{{Cite web|title=Solar Still | website=Practical Survivor|url=http://www.practicalsurvivor.com/solarstill|access-date=2023-01-12}}</ref> capturing water vapour released by the tree.<ref>{{cite book|last1=O'Meagher|first1=Bert|url=http://www.vks737.on.net/pdfs/survival.pdf|title=Aids to survival: a handbook on outback survival|last2=Reid|first2=Dennis|last3=Harvey|first3=Ross|date=2007|publisher=Western Australia Police Academy|isbn=978-0-646-36303-5|edition=25th|location=Maylands, W.A.|page=24|access-date=7 February 2017}}</ref> The plastic allows photosynthesis to continue.

In a 2009 study, variations to the angle of plastic and increasing the internal temperature versus the outside temperature improved output volumes.

Unless relieved the vapour pressure around the branch can rise so high that the leaves can no longer transpire, requiring the water to be removed frequently.

Alternatively, clumps of grass or small bushes can be placed inside the bag. The foliage must be replaced at regular intervals, particularly if the foliage is uprooted.

Efficiency is greatest when the bag receives maximum sunshine. Soft, pulpy roots yield the greatest amount of liquid for the least amount of effort.