# 1.2.3 Measurement Techniques

### Measurement Techniques

• Common instruments used in Physics are:
• Metre rules – to measure distance and length
• Balances – to measure mass
• Protractors – to measure angles
• Stopwatches – to measure time
• Ammeters – to measure current
• Voltmeters – to measure potential difference
• More complicated instruments such as the micrometer screw gauge and Vernier calipers can be used to more accurately measure length

• When using measuring instruments like these you need to ensure that you are fully aware of what each division on a scale represents
• This is known as the resolution
• The resolution is the smallest change in the physical quantity being measured that results in a change in the reading given by the measuring instrument
• The smaller the change that can be measured by the instrument, the greater the degree of resolution
• For example, a standard mercury thermometer has a resolution of 1°C whereas a typical digital thermometer will have a resolution of 0.1°C
• The digital thermometer has a higher resolution than the mercury thermometer

Measuring Instruments Table

#### Micrometer Screw Gauge

How to operate a micrometer

#### Vernier Calipers

How to operate vernier calipers

### Author: Ashika

Ashika graduated with a first-class Physics degree from Manchester University and, having worked as a software engineer, focused on Physics education, creating engaging content to help students across all levels. Now an experienced GCSE and A Level Physics and Maths tutor, Ashika helps to grow and improve our Physics resources.
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