The properties of air
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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: It takes up space.
Purpose To demonstrate that air takes up space, and puts pressure, or pushes, on everything around it. Context
Discovery Kids :: Tell Me - How is wind created? ... It sits above the planet, held in place by gravity.
At this Web site you can study aerodynamics at your own pace and to your own level of interest. Some of the topics included are: Newton's basic equations of motion ; the motion of a free falling object, that neglects the effects of aerodynamics; the terminal velocity of a falling object subject to both weight and air resistance ; the three forces (lift, drag, and weight) that act on a glider ; and finally, the four forces that act on a powered airplane. Because aerodynamics involves both the motion of the object and the reaction of the air, there are several pages devoted to basic gas properties and how those properties change through the atmosphere. This site was created at NASA Glenn as part of the Learning Technologies Project (LTP) .