Error of the Inertia Moment Using Torsion Pendulum Method

The method of torsion pendulum is an effective method to measure rotational inertia,The most important things of which is the analysis of error. The error coming from air damping is analysis in the measurement of inertia moment using torsion Pendulum method. It is given that the variation of the torsion constant after loading the weight and its influence on the measurement of the moment of inertia. The results have importantly practical significance to improve the measurement accuracy,choosing experimental methods and developing laboratory instruments.