We know for a fact that air has mass, density and weight. So what? Is there any way to use this to our advantage? The answer is yes, we can use density as an advantage in Hot air Balloon, and Pressure as an advantage using an airfoil. It is known that air decreases in density as the temperature increases. The air expands and takes up more space Due to the increase in kinetic energy the molecules move further apart. When the air is expanded with the same amount of volume it is in fact more lighter. This is where they come up with a name of "lighter then air vehicles" This is the basis of Archimedes' Principal.
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