測試金屬製環球經加熱後膨脹之情形
金屬製附柄二支，銅球直徑29mm一支，環狀孔徑28mm、30mm各一個
Demonstrates thermal expansion of metals.
When the ball and ring are at the same temperature, the ball passes freely through the ring.
The ball will not pass through the ring after heating.
Dimensions, 70 × 390 × 510mm.Φ 28mm and 30mm each ring,Φ29mm of the ball.
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