大气压强值多大?只有学生亲自动手参与测量印象才会深刻,据知,测量大气压强需测两个物理量:即大气压力F和受力面积S,受力面积可以用刻度尺等工具直接测出来,测量大气压力是测量大气压强的关键和难点.教学实践中引导学生应用“二力平衡”的原理、“等效替代”的思想巧测大气压力值收到了良好的效果. Only the students involved in measuring the impression will be profound, it is understood that the measurement of atmospheric pressure to be measured two physical quantities: the atmospheric pressure F and the force area S, the force area can be measured directly with a scale and other tools , The measurement of atmospheric pressure is the key and difficult point to measure atmospheric pressure.The teaching practice guide students to apply the principle of “two balance ”, “equivalent replacement ” thoughtfully measured atmospheric pressure value has received good results.