Common practical techniques that use apparatus include filtration, evaporation and distillation, Drawn in pencil. Lines should be firm and continuous with no gaps or shading - not sketchy like in art.

and the relative merits of the various still-heads and other forms of apparatus employed in the processes of fractional distillation were carefully inquired into and compared. The rapid ...

Distillation is one of the oldest methods of water treatment and is still in use today, though not commonly as a home treatment method. It can effectively remove many contaminants from drinking water, ...