Longman Handbooks are pocket sized reference volumes which aim to explain clearly and concisely the terms and concepts likely to be used regularly by science students from GCSE to undergraduate level. The definitions are grouped under topic headings to help the reader build up a full picture of specific subject areas and to enable the student to understand and distinguish between related words. There is an index allowing fast access for those seeking the meaning of a particular term and there are full colour explanatory illustrations and diagrams throughout.