実験

1. Origins, structure, and basic meaning

• Structure: 実験 (じっけん) is an action noun for a controlled procedure used to test a hypothesis through observation or measurement.
• Basic usage: 簡単な実験を行う makes a hypothesis-testing procedure the object performed, while 実験で使った器具 marks the experiment as the setting in which equipment was used.

2. Common pitfalls and similar expressions

• Test procedure and usage context
  • 実験を行う performs the full procedure, whereas in 実験で使う, で marks the activity in which an instrument was used. Returning equipment is not itself an experimental result.