Rev. Notes > IGCSE > Length and time Previous Topic Length and time Next Topic Topics
 Physical quantities Conversion of units Length Length-Measurement Micrometer Micrometer - Pitch Micrometer - Least count Micrometer - Zero error Micrometer - Data Table Time Multiples / submultiples of time Stop-clock Standard form Parallalax error Simple pendulum Amplitude of simple pendulum Time period of simple pendulum Frequency of simple pendulum

## Micrometer

Micrometer is used for more accurate measurements of the small lengths. e.g measuring the diameter of a wire or thickness of a small plate.

A micrometer screw gauge consists of a fine screw of usually 1 ot 0.5 mm pitch, which moves when rotated through a nut as shown in the fig.

There are two scales, the linear millimeter scale is parallel to the axis of the screw and the circular scale at the end of the screw is divided in to 100 or 50 equal parts, so that when the screw is turned through one division, it moves through 100th or 50th part of its pitch as the case may be.

To use the micrometer we have to know the following things.

Pitch of the micrometer screwgauge

Least count of the micrometer screwgauge

Zero error

How to make the data table to record the values

 Sarika Said : out put is given in the book which u have copied.so it was not useful. 06/05/17 06:20 AM

 yo mama Said : well it is informative but out of date but otherwise helpful 30/03/16 09:56 PM

 Edward Said : Very good helped me so much!!! 14/03/15 02:30 PM

 Cara Delivingne Said : This website is very helpful. However, there are still a few changes you can make to it, now that the syllabus has completely been modified. Thank you for your notes though! Xx 11/12/14 08:34 PM

 zuhi Said : where are the SI units,symbols,Prefixes,and diagrams ? 27/09/14 09:05 AM

 ghost Said : bluffmaster u will find past papers at www.xtremepapers.com 22/09/14 11:12 AM

 Daisy Said : I like ur comment Muffin :) 15/02/14 12:05 PM

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 whatever Said : you are wierd dumbass 08/05/12 10:46 PM

 shaheer salim Said : there s a mistake its 1cm(square) = 100 mm(square) 01/03/12 01:04 AM