The Angel's share describes a phenomenon of winemaking or aging after distillation. A certain portion of a wine's liquid volume evaporates, and escapes from the barrel it is aged in. Grow and harvest grapes. ... Strathisla whisky distillery in Keith, Scotland Distillation is a means of separating liquids through differences in their boiling points. ... Evaporation is the process whereby atoms or molecules in a liquid state (or solid state if the substance sublimes) gain sufficient energy to enter the gaseous state. ...