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Across 2. An upward force exerted by a fluid, that opposes the weight of an immersed object 4. The frequency of the oscillations of alternating current (AC) (2 Words) 5. Form of radiation used to heat up food 8. The prevailing cosmological model that describes the early development of the Universe (2 Words) 10. The mathematical study of change 14. Discoverer of absolute zero (2 Words) 16. "C" in "E=mc2". (3 Words) 17. An interdisciplinary science using methods of, and theories from, physics to study biological systems 18. A physical constant that is the quantum of action in quantum mechanics (2 Words) 20. A stellar explosion 21. A branch of mathematics that studies triangles and the relationships between their sides and the angles between these sides 23. A sequence of reactions where a reactive product or by-product causes additional reactions to take place (2 Words) 26. Spatial period of a wave 27. A type of magnet in which the magnetic field is produced by the flow of electric current 28. An instrument that is used to measure current 29. A scientific instrument used in meteorology to measure atmospheric pressure

Down 1. Fourth state of matter 2. The ubiquitous ionising radiation that the general population is exposed to (2 Words) 3. A scale and unit of measurement for temperature (2 Words) 6. The rate at which the velocity of a body changes with time 7. The branch of astronomy that deals with the physics of the universe 8. A measure of a substance's resistance to uniform compression (2 Words) 9. Variants of a particular chemical element 11. Stephen ______, physicist 12. Billionth of a meter 13. A region of space-time where gravity prevents anything, including light, from escaping (2 Words) 15. Consist of two protons and two neutrons bound together into a particle identical to a helium nucleus (2 Words) 19. A basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons 22. The path that a moving object follows through space as a function of time 24. The tendency of dissimilar particles or surfaces to cling to one another 25. A quantity that has both magnitude and direction