一、填空题 (每空格 1分 ,计 31分 )1 .证明大气压存在的著名实验是 ;意大利科学家首先测定了大气压的数值。2 .潜水艇是靠改变来实现上浮和下沉的 ,气象台放出的探测气球是靠降回地面的 ;密度计是利用工作的。3.1个标准大气压等于帕 ,相当于厘米高水银柱产生的压强 ,相当于米 First, fill in the blanks (1 point for each space, 31 points) 1. A famous experiment that proves the existence of atmospheric pressure is; Italian scientists first measured the value of atmospheric pressure. 2. The submarine is based on changes to achieve floating and sinking, and the detection balloon released by the meteorological observatory is returned to the ground; the density meter is used for work. 3.1 standard atmospheric pressure is equal to Pa, which is equivalent to the pressure generated by a centimeter high mercury column, equivalent to meters