Two of the positions are normally used to determine air density based on the measured difference in mass between two airbuoyancy artefacts.
二位置通常使用确定空气密度根据在大量上的被测量的区别在二空气浮力人工制品之间。
3
In the experiment of measuring gravity acceleration with a pendulum, a few error factors are existed, such as complex pendulum, airbuoyancy, air resistance and initial displacement.