環かん球きゅう法ほう

noun

ball-and-ring method; ring-and-ball test

A chemistry laboratory technique for demonstrating thermal expansion of solids, or a standard test for softening point of bituminous materials. The term is domain-specific and rarely encountered outside technical contexts.

• 環かん球きゅう法ほうは、固こ体たいの熱ねつ膨ぼう張ちょうを示しめす古こ典てん的てきな実じっ験けんです。

  The ball-and-ring method is a classic experiment demonstrating thermal expansion of solids.

• アスファルトの軟なん化か点てんは環かん球きゅう法ほうで測そく定ていされます。

  The softening point of asphalt is measured by the ring-and-ball test.