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Across 5. another name for heat energy 9. cannot be changed 14. Lower fixed point (3 Words) 16. high density fluids do this 17. heat transfer where no medium are needed 19. The main source of heat on Earth 21. What happens to the particles when a gas becomes a liquid 22. heat causes the particles to do this 24. The temperature at which a liquid turns to gas (2 Words) 26. This changes as something expands 27. A method of heat transfers which needs no particles

Down 1. Upper fixed point 2. Where conduction and convection cannot happen as there are no particles 3. Particles transfer heat by knocking their neighboring particles and passing the energy along 4. form of energy 6. A unit for temperature 7. makes solid to conduct heat faster 8. degrees celscius 10. zero degreescelsius 11. heat transfer by fluid 12. What happens to the particles when a liquid becomes a gas 13. heat transfer by contact 15. Gas and liquid 18. poor conductors of heat 20. What happens to the particles when a solid becomes a liquid 23. Lower density fluids do this 25. A measurement of how hot something is