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A new and improved twist on the traditional Ball & Ring Apparatus!
This precision-machined thermal expansion demonstration is literally a &"2-for-1&" teaching tool because it can be used to demonstrate both linear and spherical expansion. At room temperature, the 7.5cm-long rod fits snugly inside the slot, and either end of the rod fits into either hole in the gauge. When heated with a propane torch (not included), the rod no longer fits in the slot and only one end fits in one of the gauge's holes.



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