Problem No.1 Invent yourself SHI Ruikang, Team China

Topic Precise weighting. Study the physical effects that influence precise weighting of solid objects with a mass of 10 to 100 g.

Our statement How does temperature influence the result of weighting an object with an electronic balance?

Outline PART I The operating principle of electronic balance PART II Theoretical analysis PART IV Experiment PART V Conclusion PART VI References

I. The operating principle of electronic balance Force balance: Gravity and Ampere’s force

I. The operating principle of electronic balance Put weight on the plate Gravity increases A light barrier triggers a sensor The current in the coil increases The plate is balanced again

I. The operating principle of electronic balance When the forces are balanced, an A/D converter transforms the current intensity into digital signal. Thus, the balance can show the weight of the object.

II. Theoretical analysis Gravity: Ampere’s Force:

II. Theoretical analysis When temperature changes: and will differ.

II. Theoretical analysis Δm/g Δ𝑇/ ℃

III. Experiment

Δm/g ℃

Conclusion

References 《电子天平温度漂移的产生及其补偿的方法》-邓志军

Thank you for you attention!