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Across 1. The temperature at which a liquid turns to gas 5. degrees celscius 8. Where conduction and convection cannot happen as there are no particles 10. Lower density fluids do this 11. A method of heat transfers which needs no particles 12. makes solid to conduct heat faster 14. Particles transfer heat by knocking their neighboring particles and passing the energy along 15. What happens to the particles when a solid becomes a liquid 16. What happens to the particles when a gas becomes a liquid 18. form of energy 20. This changes as something expands 21. Lower fixed point 22. heat causes the particles to do this 23. A measurement of how hot something is 24. What happens to the particles when a liquid becomes a gas 25. zero degreescelsius 26. The main source of heat on Earth 27. heat transfer by contact

Down 2. Upper fixed point 3. poor conductors of heat 4. high density fluids do this 6. Gas and liquid 7. heat transfer where no medium are needed 9. A unit for temperature 13. another name for heat energy 17. heat transfer by fluid 19. cannot be changed