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高中《生物》课本在阐述水分代谢时,引用了渗透压,吸水力等概念。关于渗透压和吸水力,不同的教科书和文献有不同的提法,现在的高中教材对这部分内容自1982年以来已改动多次,它是教学中的难点。实际上渗透压、吸水力等概念是不够准确,缺乏充分的科学依据的。现在人们根据热力学原理,提出了水势、渗透势等一系列新概念来代替旧术语,对渗透作用作了较好的说明。
High school “biology” textbook in the description of water metabolism, citing the concept of osmotic pressure, water absorption. With regard to the osmotic pressure and water absorption, different textbooks and documents have different formulations. The current high school textbooks have changed this part of the content several times since 1982, which is a difficult point in teaching. In fact, the concept of osmotic pressure, water absorption is not accurate enough, the lack of full scientific basis. According to the principle of thermodynamics, people now proposed a series of new concepts, such as water potential and infiltration potential, to replace the old ones and give a better explanation of the infiltration.