*Study Unit: *Units
of Measurement in Science

Produced by Graham Currell, University of the
West of England, Bristol and Rossana Wright, University of Nottingham, in association with:, and

● Royal Society of Chemistry, 'Discover Maths for Chemists' website

**This is a draft version of a new
Study Guide - any comments, corrections or suggestions welcome** -
graham.currell@uwe.ac.uk

This study unit aims to develop the skills for handling the units of measurement used in science.

This is achieved by a series of **video tips** and associated
**QVAs - questions **with **video worked answers**.

**Introduction**

Video Introduction

Download: ‘Units in Science’ (pdf file)

**1. Using SI prefixes: **

QVAs - questions + video answers

Video Tip: If you need to end up
with the power, 10* ^{x}*, as the required prefix, then multiply the
'unit' expression by 10

**2. Basic unit conversion: **

QVAs - questions + video answers

Video Tip: Rearrange the conversion equation to get a value
of 1.0 for the *starting unit *on the LHS of the conversion.

**3. Handling ‘power’ units: **

QVAs - questions + video answers

Video Tip: It is important to include the
*appropriate power*
of ten in the unit conversion.

Video Tip: Units with
*negative* powers can be evaluated by
putting the unit in the denominator of the expression.

**4. Conversion of combined units: **

QVAs - questions + video answers

Video Tip: Perform combined conversions one step at a time.

**5. Using ‘units’ to understand equations: **

QVAs - questions + video answers

Video Tip: Use the fact that the units on both sides of an equation must have the same base units.

**6. Examples of using units in science: **

QVAs - questions +
video answers
- *pV* = *nRT*

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