-ii-Length

Measuring Length.

Length is “the distance between two points in a space”.

According to SI units, the length quantity is expressed in meter.

There are several kinds of measuring devices used to measure quantity of length, among others, are as follows.

Tools used…

a-   Measuring tape.

b-   Rule.

c-   Vernier callipers.

d-    Micrometre

Revise your Hany El-Gezawy notes

a- Measuring tape

measuring-tape-belt

_2009524448090953

how to use it

b- Rule

Steel ruler

The most common, and the best known, piece of measuring equipment

What is Zero error?

Reducing reading errors

1-   Taking several readings of the subject to be measured can also help to reduce reading errors

2-   Avoid parallax error.

 Parallax error


Always align your eye with the position being measured
When using such instruments, parallax error must be avoided.

d- Micrometre

vfig10a

The measurement of a small distance (use of a micrometre screw gauge)

Micrometres are used to measure small distances accurately (has accuracy until 0.01 mm. The screw micrometre is usually used to measure tiny or small objects.)

Reading micrometer

http://www.planetspring.com/pages/how-to-measurement-micrometer.php

MORE about
c- Reading vernier callipers

vfig03a

http://www.tresnainstrument.com/how_to_read_a_vernier_caliper.html

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