Clouds are mostly made up of water vapor, which is indeed a gas. Air itself isn't a gas, but it is made up of many different gases, such as nitrogen, oxygen, argon, carbon dioxide, and many others.
mustard gas
It's a gas
In a "hot air" balloon, which you refer to in your question, the gas is hot air. Heated air rises, so the balloon rises. The gas used in the burner, to heat the air, is propane.
hot air or hot gas
Air is an example of a gas-gas solution.
gas gas
Air. (Oxygen, Carbon Dioxide)
Gas in gas
Air is classed a gas
Gas
GAS
No its not, air is actually and example of gas.
There are a number of examples of solid in gas solutions, such as smoke, in which carbon and air are in the form of a solution. Automobile exhaust is another example of solid in gas solution. An example of such solution is Iodine vapors in the air.
Air
The common example is air.
moth ball and air