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acid aerial aircraft alloys alternating current ampere amplitude modulation angle Archimedean screw astrocompass atmospheric atomic number B.Sc C.Eng calcium camera carbon carrier wave cathode ray tube cell chemical chemistry circuit coal coil colour compounds crystal detector Device for measuring electric charge electrolysis electromagnetic electromagnetic radiation electronic energy engine ferromagnetism fibre film fluid force frequency galvanometer gases glass guns heat hydrogen industry instruments internal combustion engine iron joules lamps lens light liquid machines magnetic manufacture mass materials mechanical Metallic element mixture molecules motion motor navigation nuclear nuclear fission optical oxide oxygen Particle detector photographic physics plastics Prefix denoting pressure producing pump radiation radio rays reaction resistance salt scale sodium solid solution sound Subatomic particle substance sulphur surface techniques telescope temperature term transmission tube turbine types unit vacuum vapour vehicles velocity voltage wave wavelength weight welding wire X-rays