Explain how the use of CNG in automobiles has reduced pollution in our cities.
Combustion of fuels like petroleum causes the addition of many harmful pollutants like un-burnt carbon, particulate matter and many fume gases enter the air and cause respiratory diseases.
Compressed Natural Gas (CNG) produces these harmful products in very less quantity. It is a comparatively cleaner fuel. Therefore, the use of CNG has reduced pollution in our cities.
Fill in the blanks: (a) Burning of wood and coal causes _____ of air. (b) A liquid fuel, used in homes is _____ . (c) Fuel must be heated to its _____ before it starts burning. (d) Fire produced by oil cannot be controlled by ______ .
Compare LPG and wood as fuels.