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pubchem.ncbi.nlm.nih.gov/compound/ethane

ETHANE is a colorless odorless gas. It is easily ignited. The vapors are heavier than air. It can asphyxiate by the displacement of air. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket.

www.answers.com/Q/Is_ethane_heavier_than_air

It is slightly heavier than air. Go. ... Natural gas is mostly methane but does contain small amounts of heavier hydrocarbons, ethane, propane, and butane, but the mean density is still less than ...

www.answers.com/Q/Is_methane_is_heavier_than_air

Methane gas settles down because methane gas is heavier than and is carried by the upward displacement of air. ----- The density of methane is 0,717 g/L and the density of air is 1,2 g/L at 0 0C ...

www.quora.com/What-types-of-gases-are-heavier-than-air

You can’t weight air. But you can find its density. Air density or mass per unit volume of Earth's atmosphere is, 1.225 [math]kgm^{-3}[/math]This is the density at the sea level at 15°C. Some gases are lighter than air like, Ammonia - [math]0.717k...

en.wikipedia.org/wiki/Ethane

Until they warm to room temperature, the vapors from liquid ethane are heavier than air and can flow along the floor or ground, gathering in low places; if the vapors encounter an ignition source, the chemical reaction can flash back to the source of ethane from which they evaporated. Ethane can displace oxygen and become an asphyxiation hazard

worldbuilding.stackexchange.com/questions/14792/deadly-heavier-than-air-gas

Deadly, Heavier than Air Gas. Ask Question 36. 7 ... Ethane Is besides methane the component of natural gas. While methane is lighter than air, ethane is heavier, colorless, odorless and poisonous in higher concentrations. share | improve this answer. edited Apr 22 '15 at 20:28.

en.wikipedia.org/wiki/Lighter_than_air

Only certain lighter than air gases are suitable as lifting gases. Dry air has a density of about 1.29 g/L (gram per liter) at standard conditions for temperature and pressure (STP) and an average molecular mass of 28.97 g/mol, and so lighter than air gases have a density lower than this.

answers.yahoo.com/question/index?qid=20110325055333AAK0N4r

Okay people oxygen has a mass of 16, but in nature it is always O2 which is 32 g/mol, so methane is not heavier than air in it s natural state.

www.gasinnovations.com/literature/MSDS-Sheets/MSDS-PENTANE.pdf

SPECIFIC GRAVITY Lighter than water. RELATIVE DENSITY, (air=1) Heavier than air SOLUBILITY IN WATER Negligible DESCRIPTION At room temperature and atmospheric pressure n-Pentane is colorless and flammable with slight characteristic odor. FIRE AND FLAMMABLE LIMITS IN AIR 1.4 – 8.3 % by volume

www.antargaz.be/en/5-important-differences-between-natural-and-propane-gas

Propane gas is heavier than air while natural gas is lighter. The relative density of propane gas when compared to air is 1.56. Propane gas is, therefore, heavier than air. When there is a leak, it will accumulate at the lowest points such as basements, sewer drains, etc. This means that specific measures apply to propane gas installations.