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不少商品包装为了防振防撞击、防潮,常在商品外衬垫一层硬泡塑块。硬泡塑块具有良好的绝缘性、绝热性,又轻而不易变形,同时易于加工,易于粘接,利用它可以做许多物理实验,以下列举多例供参考。一、制作小密度固体物质演示体在初中物理讲“密度”时常用铁块、木块比较说明密度的意义,倘若我们用锋利的刀切割一块硬泡塑块方体块让学生观察测量,并与铁块、木块比较会加深学生对密度物理意义的理解,因硬泡塑块的密度比木块
In order to prevent vibration, impact, and moisture, many commodity packagings are often lined with a layer of rigid foamed plastic. The rigid foam block has good insulation and heat insulation, is light and not easily deformed, and is easy to process and easy to bond. It can be used for many physics experiments. The following are examples for reference. First, the production of small-density solid material demonstration body in the junior high school physics “density ” commonly used iron blocks, wood blocks to explain the significance of the density, if we use a sharp knife to cut a rigid foam block block for students to observe and measure , and the comparison with iron blocks and wood blocks will deepen students’ understanding of the physical meaning of density, because the density of rigid foam blocks is higher than that of wooden blocks.