Obviously, air has more than four properties. However, this question is most likely inquiring about four basic properties of air that you could explain and demonstrate to a child to prove that it exists. That being said, the four most basic properties of air are:
Note: Their are many types properties of matter these are only some.
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Two important properties of air are its compressibility, meaning it can be easily squeezed into smaller volumes, and its ability to expand when heated.
It is an air mass.
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An air parcel is a theoretical volume of air used in meteorology to study and analyze atmospheric processes. It is typically considered as a small, imaginary cube of air that retains its properties as it moves within the atmosphere. By tracking the behavior of air parcels, meteorologists can better understand the dynamics of weather systems.
Temperature and moisture content are the two main properties that characterize an air mass. Air masses are classified based on the temperature and humidity conditions they acquire from their source region.