1) Water technology
Found on
https://www.crosswordclues.com/clue/solar-still
A solar still is a simple way of distilling water, using the heat of the Sun to drive evaporation from humid soil, and ambient air to cool a condenser film. Two basic types of solar stills are box and pit stills. In a solar still, impure water is contained outside the collector, where it is evaporated by sunlight shining through clear plastic. The...
Found on
http://en.wikipedia.org/wiki/Solar_still
solar still A device used to desalinate or distill water by means of solar energy; that is, sunlight heats the water within a receptacle (still) by means of a greenhouse effect.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1978/5
No exact match found.
