玻璃管中的气柱有稳定长度吗？崔万仁（河北万全中学，０７６２５０）笔者从各地的高考模拟试题中，发现有许多地方的模拟题都有这样一道题：如图１所示，内径均匀一端封闭的直玻璃管水平放置，在开口端处有一段水银柱将管内空气封闭，管内空气柱长２０ｃｍ．如果将开口端... Is there a stable length of the air column in the glass tube? Cui Wanren (Hebei Wanquan Middle School, 076250) The author from the college entrance examination simulation test questions, found that there are many places in the simulation questions have such a problem: as shown in Figure 1, the inner diameter of a closed end of the glass tube placed horizontally, in the open end There is a mercury column to seal the air inside the tube, and the length of the air column in the tube is 20cm. If the open end ...