The Canadian Encyclopedia — neutral, cited, updated
July 26, 2026Sources cited
Canadianwire.
Canada’s encyclopedia & explainer
Home›Science & Nature›Chemistry›Propane
Science & Nature • Chemistry

Propane

Propane is a three-carbon alkane with the chemical formula C3H8.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Propane is a three-carbon alkane with the chemical formula C3H8. It is a colourless, easily liquefied gas that is commonly produced during natural gas processing and petroleum refining. Propane is widely used as a fuel, often as a component of liquefied petroleum gas (LPG).

Chemical properties

Propane is a saturated hydrocarbon in the alkane family with the molecular formula C3H8 and the structure CH3CH2CH3. It is colourless and, in its pure form, odorless.

Production and occurrence

Propane is found naturally in fossil fuel sources and is separated during natural gas processing and petroleum refining. It may also be present as part of liquefied petroleum gas (LPG).

Uses

Propane is widely used as a fuel for heating, cooking, industrial equipment, and some transportation applications. Because it is easily liquefied, it is commonly stored and transported in pressurized containers.

Safety and handling

Because propane is flammable, it is typically sold with an added odorant to make leaks easier to detect. Its ability to form a liquid under pressure makes bulk storage practical, but it requires controlled handling.

Key facts

  • Propane is a hydrocarbon made of three carbon atoms and eight hydrogen atoms.
  • Propane is a gas at ordinary temperature and pressure but can be liquefied under pressure for storage and transport.
  • Commercial propane is commonly obtained from natural gas and crude oil processing.
  • It is a major component of LPG and is used in domestic, industrial, and transport fuel applications.
  • Propane is typically odorized before sale so leaks can be detected more easily.
🍁
Canadian context

Propane is used across Canada for home heating, cooking, agriculture, and industrial applications, and Canadian consumers often encounter it as bottled fuel or as part of LPG supply chains.

Frequently asked questions

What is propane?
Propane is a three-carbon alkane hydrocarbon with the formula C3H8.
Is propane a gas or a liquid?
Propane is a gas at standard conditions, but it becomes a liquid when compressed.
Where does propane come from?
Commercial propane is usually separated from natural gas and petroleum refining streams.
What is propane used for?
It is used mainly as a fuel, including in heating, cooking, industrial uses, and as a component of LPG.
Why does propane have a smell?
Pure propane is odorless, but an odorant is added before sale so leaks can be detected more easily.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/Propane
    Supports: Chemical formula, alkane classification, physical state, LPG use, and production from natural gas processing and petroleum refining.
  2. Encyclopaedia Britannica — https://www.britannica.com/science/propane
    Supports: Propane as a colourless, easily liquefied hydrocarbon, its formula, source from natural gas and refining, and boiling point.
  3. Propane.com — https://www.propan e.com/about-propane/propane-chemical-structure-and-formula/
    Supports: Odourless nature, added odorant for safety, liquefaction under pressure, and formula.
  4. U.S. Energy Information Administration — https://www.eia.gov/kids/energy-sources/propane/
    Supports: Propane as a fuel made from natural gas and crude oil, molecular composition, and use as a clean-burning fossil fuel.
  5. PubChem — https://www.pubchem.ncbi.nlm.nih.gov/compound/6334
    Supports: Molecular identity, formula, and appearance as a colourless gas with faint petroleum-like odour.