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在《气体性质》教学中,学生对一些基础知识理解不透,提出了一些似是而非、易于混淆的问题,很有必要向他们解释清楚。 问题1 气体的压强是由于气体重力引起的吗? 释疑 我们知道,压强是由于压力作用引起的,固体、液体的压强,一般说来,它们的压力来源于它们所受的重力,依此类推,大气压强就是由于地面上方大气层空气重力压在地面上形成的,能不能依此类推得出气体压强就是由于气体重力引起的结论呢?显然不能,例如打足了气的足球内气体压强大于外界大气压强,然而足球内少量气体的重力却很小,可以忽略不计,显见,这绝非足球内气体的重力作用引起了气体压强。
In the teaching of “The Nature of Gas”, students are not able to understand some basic knowledge, and they have raised some plausible and confusing issues and it is necessary to explain them clearly. Question 1 Is the pressure of gas caused by the gravity of gas? It is known to us that pressure is the result of pressure. The pressure of solids and liquids. Generally speaking, their pressure comes from the gravity they receive, and so on. Atmospheric pressure is due to the formation of atmospheric gravity above the surface of the air pressure on the ground, can it be assumed that the gas pressure is due to the gravity of the gas conclusion? Obviously not, for example, football gas pressure is stronger than the external atmospheric pressure Strong, but the gravity of a small amount of gas in football is very small, negligible, obviously, this is not the gravity of gas inside the football caused by the gas pressure.