Knowledge, capabilities and practices associated with research and application of electromagnetism, continuum and classical mechanics, quantum mechanics, and thermodynamics. May also include studies in materials, cryogenics, acoustics, and electromagnetic fields ranging from DC to X-ray. It also includes the development of sensors necessary to carry out these studies. Involves ability to conduct microgravitational research designed to answer basic questions about the nature and structure of the universe and its chemical, biological and geophysical systems.