The main properties of air are:
- Air is a mixture of gases , primarily nitrogen (~78%) and oxygen (~21%), with small amounts of argon, carbon dioxide, water vapor, and other gases.
- Air is colorless, odorless, and tasteless ; it is invisible and transparent, allowing light to pass through.
- Air has mass and weight and occupies space , meaning it is matter.
- Air exerts pressure on surfaces, and this pressure can vary with altitude and temperature.
- Air can be compressed and is affected by temperature changes: it expands when heated and contracts when cooled.
- Air contains water vapor , which varies in concentration and affects humidity and other atmospheric properties.
- Air has viscosity and thermal conductivity , physical properties important for aerodynamics and heat transfer.
- At very low temperatures, air can be liquefied , and at very high temperatures, it can dissociate into ions (plasma state).
- Air molecules are in constant random motion, causing mixing and movement such as wind.
These combined properties define air's behavior in the atmosphere and its interaction with living beings and the environment.
