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July 27, 2026Short & citedBlog
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Field Notes • Chemistry

Propane

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

Updated July 27, 20261 min readCited sources

Propane is a three-carbon alkane (C3H8) that serves as a common fuel, often sold as part of liquefied petroleum gas (LPG). It is a colourless gas at room temperature but can be compressed into a liquid for storage and transport.

What it is

Propane is a saturated hydrocarbon in the alkane family, with the molecular formula C3H8 and the structure CH3CH2CH3. It is the third member of the alkane series after methane and ethane, and is colourless and odorless in its pure form.

Key details

Propane is produced during natural gas processing and petroleum refining. It boils at −42.1 °C and has a molar mass of 44.10 g/mol. Because it is easily liquefied under pressure, it is commonly stored in pressurized containers for use as a fuel in heating, cooking, and industrial equipment.

Why it matters

Propane is widely used across Canada for home heating, cooking, agriculture, and industrial applications. An odorant is typically added before sale so leaks can be detected more easily, making it safer for everyday use.

In short

  • Propane is a three-carbon alkane (C3H8) and a major component of LPG.
  • It is a gas at standard conditions but liquefies under pressure.
  • Commonly sourced from natural gas and petroleum refining.
  • Used as a fuel for heating, cooking, and industrial purposes.
Canadian angle

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.

Quick 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.
Why does propane have a smell?
Pure propane is odorless, but an odorant is added before sale so leaks can be detected more easily.

Sources

  1. Wikipediahttps://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 Britannicahttps://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.comhttps://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 Administrationhttps://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. PubChemhttps://www.pubchem.ncbi.nlm.nih.gov/compound/6334
    Supports: Molecular identity, formula, and appearance as a colourless gas with faint petroleum-like odour.