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初中物理第一册密度和压强的习题计算中,经常遇到单位换算问题。如在密度的计算题中,要把题中所给的质量单位吨、克按密度单位的规定统一为千克;体积单位毫米~3、厘米~3、分米~3按规定统一为米~3。在压强的习题中,要把题中所给面积单位毫米~2、厘米~2、分米~2统一为米~2。统一单位时要进行单位换算,单位换算的正确与否对解题结果的正确与否将起决定性的作用。 为了使学生掌握好单位
In the calculation of the density and pressure of the first grade of junior high school physics, the problem of unit conversion is often encountered. For example, in the calculation of density, the rules for the unit of mass tonnage and grams per unit of density given in the questions shall be unified into kilograms; the units of volume in millimeters ~3, centimeters 33, and decimeters 33 shall be unified as ~3. . In pressure exercises, the area units given in the questions must be in the range of mm2, cm2, and decimeter-2 to be m2. Units should be converted when they are united. The correctness of the unit conversion will play a decisive role in the correctness of the results. In order to make students master the unit