Workers in this minor group conduct pure and applied research and develop practical applications of scientific knowledge, or perform related auxiliary technical tasks, in the field of the physical sciences. They normally specialise in a particular branch of physical science, such as organic, inorganic, physical or analytical chemistry, mechanics, heat, light, sound, electricity and magnetism, electronics, nuclear physics, geophysics, geology, meteorology and astronomy, and they may specialise in developing practical applications in medical, industrial, military or other particular fields.