difference between LPG AND CNG

 CNG is basically composed of methane whereas LPG is a mixture of propane, butane and other chemicals. 
Another important difference from a physical point of view is that 
CNG does not liquefy under high pressure - it remains a gas, unless it is cooled down to at least - 164°C. LPG on the other hand becomes liquid when it is compressed or when it is cooled down (therefore the name "Liquefied Petroleum Gas"). 

CNG directly comes from a gas field. The only process, which sometimes needs to be done, is filtering the gas. But usually, the gas can be used as a fuel right away after the compression process. LPG, however, is an artificial product. It is a mixture of the above-mentioned gases. Hence, these gases need to be blended, before they can be used as fuel. 

CNG has a greater part of Hydrogen and is therefore lighter than air (this attribute in fact makes CNG very safe: once there is a leak in the system, the gas will simply be released to the atmosphere). LPG on the other hand, is twice as heavy as air. This gas is usually a by-product which accumulates from the oil drilling as well as the refinement of oil.

they r both derived from natural substances but LPG is in liquified form whear as CNG iis in compressed form.

(you should know thin 8th standard)

thanx hiba

what do you mean to say tali?

 tali?

lpg is not an eco friendly fuel but CNG is ..??

LPG-LIQUID PETROLEUM GAS

CNG-COMPRESSED NATURAL GAS

LPG means liquid petroleum gas &CNG means compreesed natural gas LPG is not a eco friend but CNG is the eco friend LPG is in a liquid form and CNG in a gasses form  

spelling difference

LPG means liquid petroleum gas &CNG means compreesed natural gas LPG is not a eco friend but CNG is the eco friend LPG is in a liquid form and CNG in a gasses form

LPG stands for Liquified petroleum gas. it is the condensed vapours produced by petrol.It is a by product of petrol.When LPG is exposed to oxygen and fire,it also supports combustion. CNG stands for Compressed Natural Gas. Natural gas is the vapours collected at the end of refinery while purifiing petroleum(fractional distillation).Natural gas is compressed to liquid and is called CNG.