Compare LPG and wood as fuels.

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 ____________.

Explain how the use of CNG in automobiles has reduced pollution in our cities.

Give reasons.

(a) Water is not used to control fires involving electrical equipment.

(b) LPG is a better domestic fuel than wood.

(c) Paper by itself catches fire easily whereas a piece of paper wrapped around an aluminium pipe does not.

Make a labeled diagram of a candle flame.