一升

1. Origins, structure, and basic meaning

• Structure: 一升(いっしょう) is one 升(しょう), a unit of volume equal to about 1.8 liters.
• Basic usage: It is used to measure liquids such as liquor and grains such as rice.

2. Common pitfalls and similar expressions

• Distinguishing volume from weight
  • 一升の米 specifies a volume of rice, not its weight. Reading the number of liters directly as the number of kilograms would confuse volume with weight.