DIMENSIONS AND MEASUREMENT OF PHYSICAL QUANTITIES
CONTENT
- Measurement of Length/Distance
- Measurement of Mass/Weight
- Measurement of Volume
- Measurement of Area
- Measurement of Time
- Units of Measurement in Industries
Measurement of Length/Distance
Length is measured using the following instruments.
(a) Metre Rule: A metre rule is a measuring device calibrated in centimetres (cm) with a range of 0 – 100cm. In using the metre rule, the eye must be fixed vertically on the calibration to avoid parallax errors. The smallest reading that can be obtained on a metre rule is 0.1cm (0.01cm).
(b) Callipers: These are used in conjunction with metre rule for measuring diameter of tubes, thickness of sheet, etc. The callipers are of two types –
(i) The external calliper and
(ii) The internal calliper.
The external calliper is used to measure the external diameters of solid objects; while the internal calliper is used to measure the internal diameters of solid objects.
(c) Vernier calliper
The vernier calliper can be used for measuring smalllinear length and diameters of objects within the range of 0-12cm at least.
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