雙金屬材料在教學玩具上的應用－以Bimetal Strip Heat Engine為例

Applications of Bimetal in teaching Toy‐Take Bimetal Strip Heat Engine for Example

巴白山(Pai-Shan Pa) ； 許兆芳(Jau-Fang Shiu)

《物理教育學刊》 9卷1期 (2008/07) Pp. 69-77

摘要

「熱脹冷縮」是大部分物質的基本現象，生活上有許多應用，但這些應用及日常現象往往因為隱藏包裝於產品機構中或變化不明顯，而不易觀察。如果能設計一個教學玩具來呈現「熱脹冷縮」的現象，寓教於樂，對於增強教學效果極有助益。本研究旨在利用雙金屬材料設計製作一個演示的教學玩具，經由雙金屬對溫度的變化，透過機構設計來改變翹翹板重心，左右擺動的同時敲響鈴聲。此教具容易觀察雙金屬受溫度變化的情形，提供教師教學及示範操作，學生學習過程兼具知識性及娛樂性。

關鍵字

演示 ； 教學玩具 ； 熱脹冷縮 ； 雙金屬 ； 娛樂性

並列摘要

Thermal expansion and contraction is a basic phenomenon of most substances and has ample applications in our daily lives. However, this phenomenon and its various applications are not easy to observe because they are often hidden by other mechanisms or barely noticeable. Therefore, a teaching toy designed to demonstrate thermal expansion and contraction will be extremely helpful in enhancing learning results. This paper focuses on the design and production of a demonstrative teaching aid integrated with a bimetal, wherein a reaction of the bimetal to temperature changes triggers a mechanism design that changes the gravity center of a see-saw, so that the see-saw tilts to either side thereof alternately to strike bells. By facilitating observation of the reaction of bimetals to temperature changes, this teaching aid not only provides teachers with teaching and demonstration activities, but also offers students a fun way to learn applied science.

並列關鍵字

Demonstrative Teaching Aid ； Thermal Expansion and Contraction ； Bimetal