組成

1. Origins, structure, and basic meaning

• Structure: The written form is 組成, read そせい. This noun denotes the composition or makeup formed by multiple components.
• Basic usage: 岩石の組成 concerns studying what composes a rock, while 組成が異なる states that two alloys differ slightly in composition.

2. Common pitfalls and similar expressions

• Rock composition studied in a laboratory
  • The rock’s composition is examined closely in the laboratory. Example: 研究室で岩石の組成を詳しく調べた。 — We closely studied the rock's composition in the laboratory.
• Two alloys with a slight difference
  • The two alloys have slightly different compositions. Example: 二つの合金は組成がわずかに異なる。 — The two alloys differ slightly in composition.