Name: Determination of linear expansion coefficientof metal

Brief introduction: expansion and contraction is an important characteristic ofmetal, in which linear expansion coefficient is an important parameter tocharacterize the expansion and contraction ability of metal materials, which isof great significance. The main purpose of this experiment is to use PIDtemperature controller and dial indicator to realize the accurate measurementof metal linear expansion coefficient. The video mainly describes the physicalsignificance of the coefficient of linear expansion of metal, introduces thereading method of the dial indicator, and then describes the measurement andcalculation process of the experimental data combined with the table. Thecalculation method of relative error is given.