It's a gas! Air consists of nitrogen and oxygen and lots of empty space.
The more inflated a ball is, the less energy it coverts to heat, and the more energy it has to bounce.
Why must bakers adjust their cake ingredients when they live at higher elevations?
As you fill a flat tire from your hand pump, you notice parts of the pump getting hot. Why would the pump get hot with all that cool air flowing through it?
Why does a space shuttle get hotter on reentry than on liftoff? Find out on this Moment of Science.
What does air actually consist of? Find out on this Moment of Science.
Air molecules are naturally elastic–they don’t stick together like water molecules, but rather bounce off each other in the open.