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在初中物理课本第一册第五章“大气压的变化气压计”一节中,谈到大气压随高度的变化规律时,有这样一段话:“离地面越高,空气越稀薄,空气的密度越小。因此,大气压随高度而减小是不均匀的,越高大气压随高度减小得越慢.在海拔2干米以内,可以近似地认为每升高12米,大气压强降低1毫米汞柱。利用这个近似规律,测出某处大气压的值,就可以计算出那个地方的大致高度。” 课本第二册第四章“汽化”一节,又谈到了液体的沸点与压强的关系:“……这表明,在压强减小的时侯,液体的沸点降低。相反,如果增加压强,液体的沸点就要升高。”至于液体的沸点怎样随压强的变化而变化,
In the section of the fifth chapter of the Physics textbook for junior middle school “barometric pressure changes in the atmosphere”, when talking about the law of atmospheric pressure changes with altitude, there is such a paragraph: “The higher the air from the ground, the thinner the air, the air The smaller the density is, the lower the atmospheric pressure with height is not uniform, the higher the atmospheric pressure is, the lower the atmospheric pressure decreases. At an altitude of 2 dry meters, it can be assumed that for every 12 meters, the atmospheric pressure decreases by 1 Millimeters of mercury. Using this approximate law, measuring the value of atmospheric pressure somewhere, we can calculate the approximate height of that place.” “The second chapter of the second volume of textbooks ” vaporization “ section, also talked about the boiling point of the liquid The relationship with the pressure: ”... This shows that the boiling point of the liquid decreases when the pressure decreases. Conversely, if the pressure is increased, the boiling point of the liquid will increase." As for how the boiling point of the liquid changes with pressure And change,