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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...

www.reference.com/science/list-gases-lighter-air-2ef84f0075c64098

Gases that are lighter than air include water vapor, methane, hot air, hydrogen, neon, nitrogen, ammonia and helium. These gases have a lower density than air, which causes them to rise and float in the atmosphere. Many lighter-than-air gases provide lifting power for airborne objects.

www.answers.com/Q/Name_all_gases_heavier_than_air

air is heavier than the other gases in the atmosphere, therefore there is less the higher up you go. share: What kind of air is heavier than another type of air? Gas is heavier than oxygen. Cold ...

boards.straightdope.com/sdmb/showthread.php?t=63829

Since the density of a gas at any given pressure and temperature depends almost entirely on its molecular weight, any gas with a molecular weight greater than Nitrogen (28) will be heavier than air. Common gases that are heavier than air include; Carbon dioxide,Oxygen and propane.

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.

www.firehouse.com/rescue/article/10495996/evolution-of-an-hazmat-acronym

Ethane is a heavier-than-air gas! In reality, the list of lighter than air materials was found to be incomplete so the HAHA MICE acronym has become obsolete when it comes to memorizing the gases ...

www.reference.com/science/gas-lighter-air-6b391099a5ae4c1d

Hydrogen, helium, ammonia, methane, neon, coal gas and pure nitrogen are all lighter than air. A pocket of air can be made lighter than the surrounding air by heating it. According to the Underwater Robotics Research Group, gases that are lighter than air have densities that are less than 1.2 kilograms per cubic meter or 1.2 grams per liter.

en.wikipedia.org/wiki/List_of_highly_toxic_gases

Definition. Toxic: it is a chemical that has a median lethal concentration (LC 50) in air of more than 200 parts per million (ppm) but not more than 2,000 parts per million by volume of gas or vapor, or more than 2 milligrams per liter but not more than 20 milligrams per liter of mist, fume or dust, when administered by continuous inhalation for 1 hour (or less if death occurs within 1 hour ...

www.sciencebrothers.org/a-very-heavy-gas

A Very Heavy Gas. Posted by Dan Science on July 21, 2016. ... That means it is 5 times heavier than air, and falls like a rock! What’s really interesting is that these three gases (air, helium, and sulfur hexafluoride) are all invisible! So when you fill balloons with each of them, they all look exactly the same but weigh much different from ...

ianbgas.co.uk/technotes/Gases-heavier-or-lighter-than-air.html

We can now compare other gases with air. The main component of natural gas is methane, chemical symbol CH4 , which means that its molecules consist of a carbon atom attached to four hydrogen atoms, giving a total weight of 12 + 4 = 16. This is considerably less than the figure for air – methane is lighter than air.