1. Practice on Measuring Length and Processing Experiment Data 11# 3016 Liu Xiaoyu

2. What we need to do in this experiment? To obtain the volume of a hollow cylinder and a sphere • What measuring tools we can use ? A metal ruler, a vernier caliper & a micrometer • Why we need to do such an experiment? 1. Know the correct use of the vernier caliper & the micrometer 2. Do some exercises for processing experiment data

3. 1).Metal ruler 1.Introduction of tools

4. Parameters for a ruler: Graduation value (i): defined as the value between two closed graduation marks. Instrument error ( ): defined as half of the graduation value.

5. 2). Vernier caliper

6. Parameters for a vernier caliper: Graduation value: defined as i=a/n. Instrument error: same value as the graduation value. Rules for reading: L=L0+ki

7. 3). Micrometer

8. Parameters for a micrometer: Graduation value: also can be defined as i=a/n Instrument error: half of the graduation value. Rules for reading: The final result = the reading – the original reading

9. 2. Experiment data 1) Height of the hollow cylinder (measured by the metal ruler)mm

10. 2). Outside & inside diameter of the hollow cylinder (measured by the vernier caliper) mm

11. 3). Diameter of the sphere (measured by the micrometer) mm

12. 3.Data processing 1). Volume of the hollow cylinder

13. 2).Volume of the sphere