Argon.
An example of an unreactive gas that sinks in air is carbon dioxide (CO2). Due to its higher density compared to air, it displaces air and sinks towards the ground. This property makes it useful for extinguishing fires in some fire suppression systems.
Argon is the unreactive gas that makes up 1 percent of the Earth's atmosphere. It is a noble gas and is commonly used in applications where an inert atmosphere is required, such as in light bulbs and welding.
The two unreactive gases in the air are nitrogen (about 78%) and oxygen (about 21%).
Helium
Helium. Hydrogen works too but it tends to blow up. Helium is an inert gas that is very unreactive so it makes the best option.
Nitrogen.
No. Neon is a noble gas and is unreactive.
Helium is considered the most unreactive gas because it is a noble gas with a full outer electron shell, making it very stable and unlikely to react with other elements.
When liquids and gases are heated, convection currents are formed. With liquids, the heated fluid rises, cools down and then sinks back, causing a circular motion. In gases, warm air or gas rises and cooler air or gas sinks, creating vertical movements.
because the gas under the ocean that sinks ships and air craft is oxygenated in the water.
No. Convection occurs when warm air rises and cool air sinks. It is not limited to air, either, but can occur in virtually any liquid or gas.
Fog appears when cold air sinks to the ground.