Physical chemistry is a core part of all chemistry and chemical engineering degrees. The market is dominated by two books by the same author, Atkins 'Physical Chemistry' and 'Elements of Physical Chemistry'. There are a number of other books also available, but in most cases they are very similar to the Atkins books, and not better or different enough to replace them. There is a real need and opportunity for a new book, one that offers lecturers and students a different approach to physical chemistry, and that takes into account today's students backgrounds, interests and abilities. Understanding Physical Chemistry provides this alternative taking an applications/examples lead approach, yet still covering the physical chemistry students need to know. Importantly, mathematics will be introduced in context when needed, and will be carefully explaned, relfecting concerns over students weaker mathematical backgrounds, not just in the UK, but increasingly throughout Europe.