Under 53 is classed information about the theoretical aspects of the physical properties of matter and energy and their measurement, together with some applications of these properties. In general, however, the main applications of physics come in Class 6, Applied sciences and technology, some of the more important subdivisions of which are given under ' Related subjects ' on page 3.
The chemical properties of matter and the composition of substances come under 54.
BS 1000[53]:1974 history
1974BS 1000[53]:1974 Universal Decimal Classification - English full edition - Physics