NCERT Question 4 - Chapter 6 Class 8 - Combustion And Flame

Wood

LPG

Wood is in solid form

LPG  is in liquid form.Full form is Liquified Petroleum Gas

It is difficult to carry and transport

It is easy to transport in cylinders

It creates lot of smoke and pollution

It does not produce smoke and causes less pollution

Trees are cut to obtain wood,
Cutting of wood leads to deforestation

LPG is refined from petroleum which is obtained from rocks inside earth

Hence, extraction of LPG does not harm the environment

Calorific Value of wood is 17,000-22,000

Calorific Value of LPG is 55,000