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等压线图的阅读一直是高中地理教学的难点。虽然教材提供了示意图,但学生要读懂还是有一定难度。如果将等压线示意图转换为立体图,该知识点就容易理解了。要理解等压线图,首先要明白气压是怎么回事。大气是一种有质量的物质,受地球引力的吸引,大气会对地表产生压力,称为气压。海拔越低大气柱越长、空气密度越大,空气质量也越大,气压就越高;反之,气压就低。所以,通常情况下总是海拔越高气压越低。如图1
Isobaric graph reading has always been a difficult point in high school geography teaching. Although the textbook provides a schematic, students still have some difficulty reading it. This knowledge point is easy to understand if you convert the isobar diagram to a perspective view. To understand the isobaric graph, we must first understand how the pressure is going. The atmosphere is a kind of quality material, attracted by the gravitation of the earth, and the atmosphere will exert pressure on the earth surface and is called pressure. The lower the altitude the longer the column of air, the greater the air density, the greater the air quality, the higher the pressure; on the contrary, the pressure is low. So, usually the higher the altitude, the lower the pressure. Figure 1