検けん湿しつ器き

noun

hygroscope

A physics instrument that indicates humidity changes, often using a material that expands or contracts with moisture.

• 検けん湿しつ器きは湿しつ度どの変へん化かを視し覚かく的てきに示しめす装そう置ちです。

  A hygroscope is a device that visually indicates changes in humidity.