Another possible source of confusion is that some older textbooks use the term "molecular weight" to mean the molar mass.

Some textbooks now use the term microbiota.

Many textbooks use the symbol for the comoving distance.

Not all textbooks use the same terms, or use them in the same way.

This textbook is still a bestseller and used at universities worldwide.

All other textbooks and products use the Pearson brand/imprint.

Local educators would then choose which textbooks to use at their schools.

College students are now starting to scan expensive textbooks only used for a single class and trading them like song and movie files.

Likewise British textbooks use questions about mortgages, investment and interest for those whose families, or who themselves, are on social security.

Thus, textbooks on aerodynamics use more complex models to provide a full description of lift.