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--- demonstrations:4_thermodynamics:4a_thermal_properties_of_matter:ball_and_ring:start [2019/02/14 23:33] – external edit 127.0.0.1
+++ demonstrations:4_thermodynamics:4a_thermal_properties_of_matter:ball_and_ring:start [2020/03/13 20:19] (current) – demoroom
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 ====== Ball And Ring ======
-{{tag>strips expansion needs_review untagged unlocated}}
+{{tag>bimetallic thermodynamics thermal_expansion located}}
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 ===== Description =====
-Expansion of two metal objects    Classes Used: PHYS 153
+Consists of a a copper plate and copper ring mounted on a lab stand, and a steel ball with a bent length of wire affixed.
-heat expansion
 ===== Purpose =====
+Demonstrates differing thermal expansion coefficients of unlike materials; demonstrates the widening of internal holes due to thermal expansion of a volume.
 ===== Apparatus =====
+  * Copper ring/plate with hole on stand
-Ring on stand, ball, propane torch
+  * Steel ball
+  * [[demonstrations:9_equipment:propane_torch:start|Propane torch and striker]]
 ===== Setup =====
+Place the ball on either the ring or the hole in the plate. Use the blow torch to apply heat evenly to the area. Due to the dissimilar coefficients of thermal expansion, the plate/ring will expand faster than the ball and the hole will widen enough for the ball to drop through. The bent length of wire attached to the ball serves to prevent the potentially-very-hot ball from getting away, it should catch on the hole after it drops through.
-Place the ball on the ring (it should sit there nicely). Heat the setup up with the torch. The ring will expand more than the ball, allowing the ball to fall.
 ===== Notes =====
+<WRAP center round important 60%>
+**As with any demonstration involving the use of the propane torch, take caution. Don't transport the demo until is has been allowed to cool, and be careful that the ball doesn't fall and land on someone.**
+</WRAP>
-The ball can become quite hot, so be wary of where it will fall.   Updated on: 06/13/13
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-| **Location** | ---- |
+| **Location** | C4, torch on I6 |
 | **Maker** | Unknown |
 | **Current State** | Working |