Methane vs Propane: what is the difference?
Methane must be piped as a gas because it only liquefies near minus 162 degrees Celsius, while propane liquefies under modest pressure and can be bottled.
Sources and notes
- The sentence under the titlefrom sourceMoleculeFinder comparison notesThe pair's answer line.
- The two drawingscomputedMoleculeFinder rule (RDKit MCS)Each molecule's own drawing, as its page shows it. The common core, 0 of 3 atoms, is too small to align on.
Side by side
| Methane | Propane | |
|---|---|---|
| Molecular weightCalculated PubChem | 16.04 g/molCH4 | 44.1 g/molC3H8 |
| Hydrogen-bond donorsCalculated PubChem | 0 | 0 |
| Where each turns upEditorial MoleculeFinder food and product lists |
|
|
| FamilyEditorial MoleculeFinder curated | Alkanes | Alkanes |
| Everyday groupEditorial MoleculeFinder curated | Everyday chemistry | Everyday chemistry |
| Hazard labelReported ECHA, EU CLP Regulation, Safe Work Australia via PubChem | Danger | Danger |
| The supplier-filed hazard label's signal word, not a statement about ordinary use. | ||
Sources and notes
- Molecular weightcomputedPubChemComputed from the structure; the formula is under each weight.
- Hydrogen-bond donorscomputedPubChemThe hydrogens on nitrogen or oxygen that each molecule can lend to a hydrogen bond, counted from its structure.
- Where each turns upfrom sourceMoleculeFinder food and product listsEach amount is an editorial figure from our lists, not a measurement of any one product. Each mark is set by hand on the list, never inferred.
- Familyfrom sourceMoleculeFinder curated
- Everyday groupfrom sourceMoleculeFinder curated
- Hazard labelfrom sourceECHA, EU CLP Regulation, Safe Work Australia via PubChem
- ECHAfrom sourceAttributionSource: European Chemicals Agency, echa.europa.eu.
- EU CLP Regulationfrom sourceAttributionSource: EUR-Lex, Regulation (EC) No 1272/2008, © European Union.
- Safe Work Australiafrom sourceAttributionSource: Safe Work Australia, Hazardous Chemical Information System, © Commonwealth of Australia, CC BY 4.0.
- Identifiersfrom sourcePubChemPubChem CID 297 (Methane) and 6334 (Propane).
In more detail
Both are alkanes burned as fuel. Methane is the simplest hydrocarbon, CH4, and boils at about minus 162 degrees Celsius, so keeping it liquid needs cryogenic equipment and mains gas is delivered as a gas through pipes instead. Propane liquefies under modest pressure at ordinary temperatures, which is why a barbecue bottle can hold days of fuel in a few kilograms. Propane also carries more energy per unit volume, so a burner designed for one will not run correctly on the other without a jet change. Methane is much the lighter at 16.04 against 44.1 and rises when it leaks; propane is heavier than air and pools, which is a real difference in how a leak behaves.
Sources and notes
- The paragraphfrom sourceMoleculeFinder comparison notes
Questions
- What is the difference between Methane and Propane?
- Methane must be piped as a gas because it only liquefies near minus 162 degrees Celsius, while propane liquefies under modest pressure and can be bottled.
- Is Methane bigger than Propane?
- Propane is the heavier molecule, 44.1 g/mol against 16.04 g/mol for Methane. Methane is CH4 and Propane is C3H8.
Sources and notes
- The answersfrom sourceMoleculeFinderThe first is the pair's answer line; the others are read off the table above.