推荐回答（2个）
所以体温表使用前应检查里面的水银是否能“连成一气”，如果原来指示的温度较高，甩一下，利用离心力的作用，使留在外的水银尽量回到头部，再次量体温时水银柱能连成整体，是准确使用水银体温表的一种操作方式。因为人的体温，一般在掖下测量时也在35摄氏度以上，测量前，水银柱指示在35度以下，即使采用掖下测量的方式，水银膨胀时也能将断开处连接起来，所以甩的标准，只要在35度以下就行。
刚刚做了一个对比试验：用一支量程为100度的酒精温度计测量一个大保温杯内的水温，调整水温为37度时，用同一体温表在测量前甩到低于37度以下不同位置，再放置到37度的水中，一分钟后读数，基本为37度；当水温下降到36度时，原指示37度的体温表放入后读数仍为37度，只有在将体温表甩到哪怕35度多，再放入36度的水中时，才能得到36度的读数，所以，体温表使用前将原有温度指示通过甩一下，使其指示低于预期温度（测掖温在寒冷环境可能低于35度，舌下温度与肛温受环境影响较小，不会低于35度），实际测量时水银柱都能接着上升到体温，读数不会有大误差，也就是随便甩到少于35度都可以（何况凭各人手甩，也没多少准头啊）。
体温表是一种水银温度计。它的上部是一根玻璃管，下端是一个玻璃泡。在泡里和管的下端装有纯净的水银，管上标有刻度。由于人体温度最高不超过42℃，最低不低于35℃，所以体温表的刻度是35℃到42℃，每个小格代表0.1℃。
“试表”时，体温表下端的玻璃泡和人体接触，因为人体温度比体温表温度高，玻璃泡中的水银受到从身体传来的热的作用，体积膨胀，就沿着玻璃细管上升，直对水银温度和人体温度相同为止。
体温表的构造很特殊，在玻璃泡和细管相接的地方，有一段很细的缩口。当体温表离开人体后，水银变冷收缩，水银柱就在缩口处断开，上面的水银退不回来，所以体温表离开人体后还能继续显示人的体温度。
因为要让水银回到体温表下端的玻璃泡中，所以要甩，让水银回到35°C的最低点一下方便下次测量。
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