Liquefied Petroleum Gas vs. Compressed Natural Gas: Know the Difference

By Shumaila Saeed || Published on February 28, 2024

Liquefied Petroleum Gas (LPG) is a portable, clean-burning fossil fuel derived from crude oil and natural gas processing, whereas Compressed Natural Gas (CNG) is natural gas under high pressure, used mainly as a cleaner alternative to other fossil fuels.

Liquefied Petroleum Gas vs. Compressed Natural Gas

Key Differences

Liquefied Petroleum Gas, commonly known as LPG, is primarily composed of propane and butane. Compressed Natural Gas, or CNG, mainly consists of methane, compressed to less than 1% of its volume at standard atmospheric pressure.

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LPG is obtained during natural gas processing and oil refining and is stored in liquid form under moderate pressure. In contrast, CNG is stored under high pressure, which keeps it in a gaseous state.

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LPG is known for its versatility and portability, making it popular for heating, cooking, and automotive use. CNG, being less dense than air, is safer in case of a leak and is widely used in transportation due to its low environmental impact.

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In terms of energy efficiency, LPG has a higher calorific value per unit volume than CNG. However, CNG's lower emissions make it a more environmentally friendly option.

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LPG requires a relatively simple infrastructure for storage and distribution, whereas CNG requires a more complex infrastructure due to its high-pressure storage requirements.

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Comparison Chart

Composition

Mainly propane and butane

Primarily methane

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Storage Form

Stored in liquid form under pressure

Stored in gaseous form under high pressure

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Usage

Heating, cooking, automotive

Primarily in transportation

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Environmental Impact

Higher emissions compared to CNG

Lower emissions

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Energy Efficiency

Higher calorific value per unit volume

Lower calorific value per unit volume

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Liquefied Petroleum Gas and Compressed Natural Gas Definitions

Liquefied Petroleum Gas

LPG is versatile for both domestic and industrial use.

LPG heaters are common in households.

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Compressed Natural Gas

CNG is environmentally friendly due to lower emissions.

CNG vehicles contribute to cleaner air.

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Liquefied Petroleum Gas

LPG is a clean-burning fossil fuel used for cooking and heating.

Our camping stove uses LPG for cooking.

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Compressed Natural Gas

CNG is used primarily in transportation.

Many auto rickshaws run on CNG.

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Liquefied Petroleum Gas

LPG is derived from natural gas processing and petroleum refining.

The refinery produces large quantities of LPG.

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Compressed Natural Gas

CNG requires high-pressure storage systems.

Special cylinders are used to store CNG.

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Liquefied Petroleum Gas

LPG is stored and transported in liquid form.

The LPG tank needs to be refilled for the grill.

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Compressed Natural Gas

CNG is a clean alternative to gasoline and diesel.

The city's buses have switched to CNG.

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Liquefied Petroleum Gas

LPG is an efficient fuel for vehicles.

Many taxis in the city run on LPG.

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Compressed Natural Gas

CNG is natural gas compressed for use as fuel.

The new filling station offers CNG.

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Repeatedly Asked Queries

What is Liquefied Petroleum Gas?

A portable fossil fuel mainly comprising propane and butane.

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What is Compressed Natural Gas?

Methane stored under high pressure for use as fuel.

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What are common uses of LPG?

Cooking, heating, and automotive fuel.

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Is LPG environmentally friendly?

Less than CNG, but cleaner than many fossil fuels.

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Is CNG environmentally friendly?

Yes, it has lower emissions compared to other fuels.

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How is LPG produced?

From natural gas processing and oil refining.

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What are common uses of CNG?

Primarily as fuel in transportation.

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Which is more energy-efficient, LPG or CNG?

LPG has a higher calorific value per unit.

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How is LPG stored?

In liquid form under moderate pressure.

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Can LPG be used in vehicles?

Yes, it's used in LPG-fueled vehicles.

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How is CNG stored?

In gaseous form under high pressure.

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Which requires more complex storage, LPG or CNG?

CNG, due to its high-pressure requirements.

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What are the safety measures for LPG storage?

Adequate ventilation and leak detection systems.

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Can CNG be used in all types of vehicles?

No, only in vehicles specifically designed or retrofitted for CNG.

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Is LPG suitable for indoor use?

Yes, with proper safety precautions and ventilation.

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How is CNG produced?

By compressing natural gas.

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Can LPG leak be dangerous?

Yes, it's heavier than air and can cause hazards if not ventilated.

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Is CNG used globally?

Yes, it's becoming increasingly popular worldwide.

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Is CNG safe to use?

Yes, especially since it's lighter than air and disperses quickly.

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How does the cost of LPG compare to CNG?

This varies by region and market conditions.

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About Author

Written by

Shumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.

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