GAS

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Across
  1. 3. Solid residue from burning fossil fuels
  2. 5. Radioactive gas that can accumulate indoors
  3. 7. Study of heat and energy transfer
  4. 8. Describes materials that can catch fire easily
  5. 9. Device converting chemical energy to electricity
  6. 14. Colorless gas that can be deadly
  7. 15. Alcohol used as a fuel additive
  8. 17. Gas often used in lighters
  9. 19. Gas exhaled by humans
  10. 22. Material that reduces heat transfer
  11. 24. Noble gas used in some types of lights
  12. 26. Liquid form of natural gas
  13. 27. Liquefied gas often used for heating
  14. 28. Gas used in refrigeration systems
  15. 30. Describes the behavior of gases
  16. 31. Gases that trap heat in the atmosphere
  17. 33. Process of exchanging indoor and outdoor air
  18. 36. Common fuel for outdoor grills
  19. 37. Describes substances that vaporize easily
  20. 42. Colorless gas that makes up most of the air
  21. 43. Movement of gas molecules from high to low concentration
  22. 44. Engine that converts gas to mechanical energy
  23. 46. Flammable liquid hydrocarbon mixture
  24. 48. Release of gases into the atmosphere
Down
  1. 1. Sealed pot that cooks food with steam pressure
  2. 2. Gas phase of a substance that is normally liquid
  3. 4. Form of energy often produced during combustion
  4. 6. Gas used in welding processes
  5. 10. Gas produced by burning fossil fuels
  6. 11. Device that converts gas energy to mechanical energy
  7. 12. Reaction involving the addition of oxygen
  8. 13. Chemical reaction producing heat and light
  9. 16. Gas with a strong odor, used in fertilizers
  10. 18. Greenish-yellow gas used for disinfection
  11. 20. Gas used in making PVC
  12. 21. Gas that promotes ripening in fruits
  13. 23. Fossil fuel used for heating and cooking
  14. 25. Inert gas commonly used in light bulbs
  15. 29. Main component of natural gas
  16. 30. Method for analyzing gas mixtures
  17. 32. Study of gases in motion
  18. 34. System used to transport gases
  19. 35. Essential for combustion
  20. 38. Light gas used in balloons
  21. 39. Common fuel for cars
  22. 40. Lightest and most abundant element
  23. 41. Force applied per unit area
  24. 45. Renewable gas produced from organic matter
  25. 47. Gas known for its bright red-orange glow