measuring box

1. Origins, structure, and basic meaning

• Structure: 升 relates to a measuring box or volume measure; its kun-reading is ます and its on-reading is しょう.
• Basic usage: 一升, read いっしょう, is a volume of about 1.8 liters; 一升瓶, read いっしょうびん, is a bottle of that capacity.

2. Common pitfalls and similar expressions

• Volume and weight
  • When rice is measured as 一升, the measure refers to volume, not weight. Distinguish liters from units of weight.