Which type of device is used for distilling liquids?

The correct choice is the still, which is specifically designed for distilling liquids. Distillation is a process that involves heating a liquid to create vapor and then cooling that vapor to condense it back into a liquid form. A still typically consists of a boiler or a vessel for heating the liquid, a condenser to cool and condense the vapor back to liquid, and often a collection container for the distilled product. This makes it an essential apparatus in various applications, including the production of alcoholic beverages, essential oils, and other chemical products.

While a condenser is used in the process of distillation to cool the vapor and collect the distilled liquid, it does not perform the entire process on its own. An evaporator is designed primarily for evaporating liquids towards the concentration of solutions and does not facilitate the collection and condensation aspect of distillation. A filter serves a different purpose by separating solid particles from liquids or gases and is not involved in the distillation process at all. Thus, the still is the most appropriate and specifically intended device for the purpose of distilling liquids.