(2) Inject a proper amount of water into the vector cup and read the number V1; Put in five glass balls and read the indicator V2 of water level rise; Then the total volume of the ball is v = v 2-v 1? (3) The measurement error can be reduced. The volume of a single ball is smaller than the dividing value of the measuring cup. Measuring volume with five glass balls can reduce the error of measuring volume, thus reducing the error of measuring density?

1. Method for measuring glass volume: add a proper amount of water into the measuring cup (proper amount means that the water shall not exceed all the glass balls, but the water surface shall not exceed the maximum range of the measuring cylinder), and read the number V 1:

Put in five glass balls and read the indicator V2 of water level rise; Then the total volume of the ball is v = v 2-v 1.

The accumulation method is used here. The volume of a single ball is smaller than the dividing value of the measuring cup. Measuring volume with five glass balls can reduce the error of measuring volume, thus reducing the error of measuring density? . We also use this method to measure the diameter of thin copper wire and the thickness of paper.

Comments: The difference between the measurement of this question and the teaching material is that the measurement object is too small, and the accumulation method should be applied at the same time.