| Properties | Liquefied Petroleum Gas (LPG) | Liquefied Natural Gas (LNG) |
| Composition | - It mainly contains Propane (C₃H₈) and Butane (C₄H₁₀), with small amounts of propylene, butylene, and isobutylene.
| - It mainly consists of Methane (CH₄), which is the primary component of Natural Gas.
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| Source | - It is produced as a byproduct of crude oil refining and natural gas processing.
- It becomes liquid under moderate pressure or relatively low temperature.
| - It is produced by cooling natural gas to very low temperatures.
- It becomes liquid only after cryogenic cooling below −160°C.
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| Volume | - Liquid volume is about 1/260th of its gaseous volume.
| - Liquid volume is about 1/600th of its gaseous volume.
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| Storage Method | - It is stored in pressurised cylinders and transported mainly by road in cylinders.
| - It is stored in specialised cryogenic tanks and transported by special cryogenic ships to regasification terminals.
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| Infrastructure Requirement | - It is highly portable and can be made available in any region, even remote and rural areas without pipeline networks.
| - It requires re-gasification terminals where it is converted back into natural gas and pipeline networks before distribution.
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| End-User Supply Method | - It is delivered to households/industries in portable cylinders.
| - It is converted back into natural gas and supplied through pipelines as Piped Natural Gas (PNG) or used as Compressed Natural Gas (CNG) for vehicles.
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| Application | - It is used mainly for cooking, heating, industrial purposes, and automobile fuel.
| - It is used mainly for long-distance transport of natural gas and emerging use in heavy vehicles, ships, and trains.
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| Safety Characteristics | - It is heavier than air, so it may settle near the ground during leaks, increasing fire risk.
| - It must be stored in cryogenic tanks and requires trained handling to prevent vapourisation or boil-off.
- It is lighter than air, disperses quickly during leakage, making it comparatively safer.
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