塩水

1. Origins, structure, and basic meaning

• Structure: In 塩水 (しおみず), salt 塩 and water 水 combine to denote salt water.
• Basic usage: 塩水 is water with salt dissolved in it and can include brine in an appropriate context.

2. Common pitfalls and similar expressions

• Salt water and brine
  • It is not always identical in composition to seawater, so surrounding expressions establish concentration and use.