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【简答题】
如图是小刚做“估测大气压的值”的实验示意图． （1）请将下列实验步骤补充完整． A．把注射器的活塞推至注射器筒的底端，排尽筒内的空气．然后，用橡皮帽封住注射器的小孔． B．用细尼龙绳拴住注射器活塞的颈部，使绳的一端与弹簧测力计的挂钩相连，然后水平向右慢慢拉动注射器筒．当注射器中的活塞刚开始滑动时，记下______，即等于大气对活塞的压力F． C．用刻度尺测出注射器的______，记为l，读出注射器的容积V，则活塞的面积S=______． D．最后计算出此时大气压的数值p=______（写出表达式）． （2）A中测量大气对活塞的压力F应用的是______的原理． （3）请根据实验步骤将记录表格的第一行栏目补充完整（不要求填入实验记录数据）． 大气对活塞的压力F（N） 注射器的容积V（m 3 ） 活塞的横截面积S（m 2 ）
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