Gases:
* Air: Air takes up a lot of space (volume), but the molecules are spread out, giving it a very low density and therefore low mass and weight.
* Helium: Helium is even lighter than air, which is why balloons filled with it float.
* Hydrogen: The lightest element, it has a very low density and is often used in airships and balloons.
Other:
* Styrofoam: Styrofoam is a lightweight, porous material that traps a lot of air, making it bulky but light.
* Balloons: Inflated balloons have a large volume but a very low mass and weight.
* A hollow metal sphere: A large hollow sphere made of a thin metal sheet will have a significant volume but a relatively small mass.
* A large inflated rubber raft: While the rubber itself has some mass, the air inside gives it a large volume with a low overall weight.
Important Note: The relationship between volume, mass, and density is important.
* Volume: The amount of space an object occupies.
* Mass: The amount of matter in an object.
* Density: Mass per unit volume.
Objects with large volumes and small masses have low densities.
