Class exercise 1 – Measuring small lengths

Aim: To measure the thickness of my hair using a micrometer screw gauge

Apparatus: Micrometer screw gauge

Procedure and Results:

1. Observe the micrometer screw gauge. What do one division on the main scale and the rotating scale represent?

1 division on main scale = 0.5 mm

1 division on rotating scale = 0.01 mm

2. Close the anvil and spindle. Is there any zero error for your micrometer screw gauge? If yes, what is the value of the zero error?

There is zero error for the micrometer screw gauge.

The value of zero error is -0.05mm.

3. Measure the thickness of your hair at 3 different points along the length of the hair, and record your measurements, h1, h2 and h3 for each point, in the table below (make sure you account for zero error, if any). Calculate the average thickness of your hair, < h >, correcting your answer to the same number of decimal places as your measurement.

 

h1

h2

h3

< h >

Measured value / mm

0.08

0.06

0.08

0.07

Corrected value / mm

0.13

0.11

0.13

0.12

 Corrected value / cm

0.013

0.011

0.013

0.012

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