#### Overview of this book

LaTeX is a high-quality typesetting software and is very popular, especially among scientists. Its programming language gives you full control over every aspect of your documents, no matter how complex they are. LaTeX's huge amount of customizable templates and supporting packages cover most aspects of writing with embedded typographic expertise. With this book you will learn to leverage the capabilities of the latest document classes and explore the functionalities of the newest packages. The book starts with examples of common document types. It provides you with samples for tuning text design, using fonts, embedding images, and creating legible tables. Common document parts such as the bibliography, glossary, and index are covered, with LaTeX's modern approach.You will learn how to create excellent graphics directly within LaTeX, including diagrams and plots quickly and easily. Finally, you will discover how to use the new engines XeTeX and LuaTeX for advanced programming and calculating with LaTeX. The example-driven approach of this book is sure to increase your productivity.
Preface
Free Chapter
1. The Variety of Document Types
4. Working with Images
5. Beautiful Designs
6. Designing Tables
7. Contents, Indexes, and Bibliographies
8. Getting the Most out of the PDF
9. Creating Graphics
11. Science and Technology
12. Getting Support on the Internet
Index

# Writing physical quantities with units

In contrast to pure mathematics, in the natural sciences such as chemistry and physics, and in engineering, we use units in addition to quantities. We need to distinguish units from variables.

Let's take a sample. We shall write a formula that multiplies the speed s of one meter per second by the factor m. A straightforward way of doing this could be like so:

$$m \cdot s = m \cdot 1 m s^{-1}$$

The LaTeX standard output would be:

What on earth? It's pretty tempting to mathematically simplify the right side, which could be interpreted as square meters per second or as millimeters per second. Or multiply both sides by s, which may mean speed (s) or seconds. Units and variables look very similar. Furthermore, our space between 1 and m has been lost. For smart writing that fits common standards, we may require the following:

• Units to be written upright to distinguish them from italic math variables
• There to be a small space between a quantity and...