Units
The Free High School Science Texts: A Textbook for High School Students Studying Physics
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PGCE Comments - TO DO LIST - Introduction - Unit Systems - The Importance of Units - Choice of Units - How to Change Units - How Units Can Help You - Temperature - Scientific Notation, Significant Figures, and Rounding - Conclusion

PGCE Comments

Explain what is meant by `physical quantity'. -- clark: In the Introduction section, I replaced 'physical quantity' with 'measurement of a physical phenomenon'. Don't know if that's much clearer, really.
Chapter is too full of tables and words need figures to make it more interesting.
Make researching history of SI units a small project.
Multiply by one technique: not positive! Suggest using exponents instead (i.e. use the table of prefixes). This also works better for changing complicated units (km·h⁻¹ to m·s⁻¹ etc....). Opinion that this technique is limited in its application.
Edit NASA story.
The Temperature section should be cut-down. SW: I have edited the original section but perhaps a more aggressive edit is justified with the details deferred until the section on gases.