消失的玻璃棒（學生版）The trick of a ‘disappearing’ glass rod (Student's version)
STEM連繫 14.2STEM connection 14.2消失的玻璃棒The trick of a ‘disappearing’ glass rod
學習技能：Learning skill:
DIYDIY
難度﹕Difficulty:
★
時間﹕Time:
1節課1 lesson
測試的物料Materials to be tested
步驟Procedures
1. 把約50 mL的水加進燒杯中。
1. Add about 50 mL of water into a beaker.
2. 把玻璃棒放進燒杯中，看看玻璃棒有否「消失」。
2. Insert a glass rod into the beaker to see if the glass rod ‘disappears’.
3. 使用其他物料重複以上步驟。
3. Repeat the steps with other materials.
4. 現在，你可以把不同物料混合， 製作一個使玻璃棒「消失」的魔術！
4. Now, mix different materials to play the trick of a ‘disappearing’ glass rod!
試想想Think about
1.
What is the working principle of the ‘trick’?
2.
試指出你會如何在班上表演一個使玻璃棒「消失」的魔術。
2.
Suggest how you can perform a ‘magic trick’ to the class.