Definition: A glas is a traditional Swedish unit of volume, primarily used for liquids. It's a customary unit, not part of the modern SI system.

History/origin: The glas has historical roots in Swedish culture and was likely defined based on common drinking vessels or containers used in households. Its exact origin is difficult to pinpoint precisely, but it reflects traditional measurement practices.

Current use: While not a standard unit in modern contexts, the 'glas' may still be encountered in older recipes or traditional settings in Sweden. Its usage is declining as standardized metric units become more prevalent.