For measurement of metal wire coefficient,this papeies studies on copper bar with self-made hydraulic micro-displacement transfer in place of optical lever and telescope.The paper improves the traditional experiment instrument and denotes slight elongation of wire bar with the principle of hydraulic micro-displacement magnifying mechanism.According to experiment principle,uncertainty analysis and measurement data,the paper analyzes and discusses the experiment approach of hydraulic micro-displacement transfer measuring expansion coefficient of metal wire.The new approach can not only improve measuring accuracy,but also reduce test cost.The paper makes use of uncertainty with confidence probability of 95 to analyze and evaluate the measurement data,and attain more reasonable result.At last,the paper puts forwards a new approach to measure expansion coefficient of metal wire.

The paper measures the cycle of simple harmonic motion with the method of gas-track by improving gas-track system.The paper has analyzed the calibration curve between the square of the cycle and its inertial mass according to experiment principle and uncertainty analysis,combined with measurement data.And the paper validates the relationship between the square of the cycle of objects performing simple harmonic motion on the gas-track and inertial mass,which further validates that inertial mass of object is equal to its gravitational mass.