Across
- 2. Material suddenly burst into flames
- 5. Substances which catch fire at very low temperature
- 10. combustible Material which do not combust easily
- 12. On the head of the matchstick and burns
- 13. Most corrosive gas
- 14. When substances vapourise during burning Carbonmonooxide Incomplete combustion produces this gas
- 18. lowest temperature at which a substance catch fire
- 21. Oxides of sulphur and nitrogen dissolves in rainwater Sun produce heat and light by nuclear reaction
- 25. complete combustion takes place
- 26. Amount of energy produced on complete combustion of 1kg of fuel
- 27. Calorific Value of fuel efficiency
Down
- 1. Does not produce flame
- 3. Required for burning
- 4. best extinguisher
- 6. Quick burning with lot of heat and light
- 7. A chemical process in which substance react with oxygen
- 8. the most common fire extinguisher
- 9. fuel for the body
- 11. Caused by increased concentration of carbon dioxide
- 15. Safe fuel, used in automobiles
- 16. Cheap,large amount of heat and no pollutant produced
- 17. Used for fire due to electricity or oil
- 19. dry powder of chemical is used in fire extinguisher
- 20. Large amount of gas, heat and light produced
- 22. Unburnt carbon particles are present
- 23. which combust easily.
- 24. Substance that undergoes combustion.