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1. Why is it easier to squeeze a balloon filled with air than a balloon filled with water?
Air is made up of molecules that are relatively far apart. This means they can be squeezed closer together, decreasing the volume of the air. Water molecules are much closer together and resist compression.
2. Car tires are usually filled with air. What do you think this is more advantageous than having them entirely made of solids?
Car tires are filled with air because it provides a smoother ride, better traction, lighter weight for fuel efficiency and helps dissipate heat. Solid tires would be harsh, offer less grip, add weight, and retain heat, compromising overall performance.