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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...

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.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.

For gases the density may vary with the number of gas molecules in a constant volume. Density Comparison to Air: The density of several gases is compared to the density of air. Does an object float in air or sink in the air? If an object containing a gas floats on air, it is less dense than air vs. if it sinks, it is more dense than air.

Density Comparison to Air: The density of several gases is compared to the density of air. Does an object float in air or sink in the air? If an object containing a gas floats on air, it is less dense than air vs. if it sinks, it is more dense than air. Gas Density examples based upon differences in molecular weight.

The density of a gas is directly proportional to its molecular weight (see the Related Question about the density of oxygen and air to the left for why this is), and H2 gas is much lighter than air.

www.jaymarinspect.com/carbon-monoxide-detector.html

That title is a question I get a lot during home inspections. And this one - Is carbon monoxide lighter or heavier than air? Of course, any time you have gas appliances or a wood-burning fireplace, you should have at least one carbon monoxide (CO) detector in the home.

www.carbonmonoxidedetectorhq.com/carbon-monoxide-heavier-than-air

Carbon monoxide, the silent killer, makes up less than one part per million of all the air on the planet. Obviously, if some of these gases are produced locally (think air pollution sources), the concentrations of some gases can be significantly higher, including CO.

www.engineeringtoolbox.com/gas-density-d_158.html

Density - Density of different solid materials, liquids and gases. Definitions and convertion calculators. Related Documents . Air - Molecular Weight and Composition - Dry air is a mixture of gases where the average molecular weight (or molar mass) can be calculated by adding the weight of each component

www.reddit.com/.../2jzzlj/if_co2_is_heavier_than_air_why_doesnt_it_all_sink

If CO2 is heavier than air, why doesn't it all sink to the ground? ... "Like carbon dioxide, nitrogen dioxide is heavier than air so the highest concentration of gas is typically located at the silage surface, which is the area where a person will be going if they need to enter the silo for any reason." ... part of the atmosphere does indeed ...

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