Q.4 Compare LPG and wood as fuels.

LPG

(i) It does not cause pollution on combustion.
(ii) Its does not produce smoke as it undergoes complete combustion.
(iii) It is gaseous fuel which is kept under pressure by liquifying it.
(iv) It has a high calorific value (55000 kJ/kg).
(v) It can be easily transported in cylinders as it is stored in liquid state.

Wood

(i) It causes pollution on combustion.
(ii) It produces smoke and soot as it undergoes incomplete combustion.
(iii) It is a solid fuel.
(iv) It has a low calorific value (17000 kJ/kg).
(v) It can’t be transported easily like LPG fuels.