Practice on Measuring Length and Processing

Experiment Data

11# 3016 Liu Xiaoyu11# 3016 Liu Xiaoyu

What we need to do in this experiment?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 ?What measuring tools we can use ?

A metal ruler, a vernier caliper & a micrometer Why we need to do such an experiment?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

1.Introduction of tools

1).Metal ruler

Parameters for a ruler: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.

I

2). Vernier caliper

Parameters for a vernier caliper: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

3). Micrometer

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

2. Experiment data2. Experiment data

Times h

1

2

3

4

5

Mean value

1) Height of the hollow cylinder (measured by the metal ruler) mm

Times Do Di

1

2

3

4

5

Mean value

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

Times The original reading

The reading Final D

1

2

3

4

5

Mean value

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

3.Data processing3.Data processing

1). Volume of the hollow cylinder

oD

iD

h

VV

VV

2).Volume of the sphere

D

VV

VV