In order to improve students'intelligent instrument design level and practical ability,a solid density measuring instrument for teaching demonstration is designed in this project.Firstly,the weight of solids in the bas-ket in air and submerged water is measured by a pressure sensor.Then,the buoyancy is calculated by comparing the difference between the two,and the density of the solid is calculated by the Archimedes formula.The experi-mental results show that the average aluminum density of the test sample is 2627.8kg/m3 and the average relative error is 3.57％.The measuring accuracy of the solid density measuring instrument meets the design requirements and can be used as an example of intelligent instrument course design in teaching.
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