本文所要介绍的“固体热膨胀示教板”,其最大特点是实验时只要打开电源开关,即可看到固体热膨胀现象。一分钟内可反复实验几次,其方便、省时是一般实验装置所办不到的。 [实验器材]五合板(约38×26cm)一块,接线柱二个,金属(铜或铝)小滑轮二个,弹簧一根,薄金属片做的指针(涂成红色)一根,镀锌螺丝(安滑轮和指针用)三颗,康铜丝((?)0.3mm,长约50cm)一根,J1201低压电源一台,带鳄鱼夹的导线两根。 [实验装置]参照图示,先给五合板做一底座,使之能够直立,并将五合板涂上白漆,康铜丝的一端用接线柱固定,另一端与弹簧连接,弹簧的另一端固定于另一接线柱,装配时拉紧康铜丝,使弹簧适当 The most important feature of the “solid thermal expansion teaching board” to be introduced in this paper is that as long as the power switch is turned on during the experiment, the phenomenon of solid thermal expansion can be seen. The experiment can be repeated several times in one minute, which is convenient and time-saving. [Experimental equipment] Five pieces (about 38 x 26cm) one piece, two terminal posts, two metal (copper or aluminum) small pulleys, one spring, one pointer made of thin metal sheet (painted in red), galvanized Three screws (safety pulley and pointer), Kang copper wire ((?) 0.3mm, length about 50cm) one, J1201 low-voltage power supply, with two alligator clip wire. [Experimental device] Referring to the drawing, first make a base plate of the pentahedron so that it can stand upright, and paint the pentachur plate with white paint. One end of the copper wire is fixed with a terminal and the other end is connected with a spring, and the other end of the spring Fix to another terminal and tighten copper wire during assembly to make spring suitable