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初中物理第二册第二章讲热膨胀时要用到金属线膨胀演示器。它的用途有两条:一条是说明固体在温度升高的时候膨胀,在温度降低的时侯收缩。另一条是在相同的条件下,不同的金属线膨胀的程度不同。
The second chapter of the second volume of junior high school physics needs to use the metal wire expansion demonstrator for thermal expansion. There are two uses for it: One is to show that the solid expands when the temperature rises and shrinks when the temperature decreases. The other is that under the same conditions, different wires expand differently.