Question

expand cng and lpg.mention one use of each them in 40 to 60 words

Answer 1

Compressed Natural Gas(CNG)
CNG is mainly methane compressed at a pressure of 200 to 248 bars.It can be used in place of gasoline (petrol), Diesel fuel and propane/LPG.It   produces lesser undesirable gases than  petrol , diesel etc.It is found above the  oil deposits /may be collected from landfills or wastewater treatment plants where it is known as bio gas.

Liquified Petroleum Gas
LPG/LP gas simply refers to  propane ,/ are flammable mixtures of hydrocarbon gases .When specially used in vehicles it is known as auto gas.It is used for various purposes as -motor fuel , for  Rural heating , Cooking, Refrigeration etc..

Answer 2

Answer:

CNG stand for Compressed Natural Gas

LPG stands for Liquefied Petroleum Gas