* Density: The key factor is density. Density is defined as mass per unit volume (Density = Mass / Volume).
* Different Materials: Objects made of different materials will have different densities. For example, a block of wood and a block of lead can have the same volume, but the lead block will be much heavier because lead is denser than wood.
Example:
* Imagine a 1-liter bottle filled with water.
* Now imagine a 1-liter bottle filled with feathers.
* Both have the same volume (1 liter), but the water bottle will be much heavier because water is denser than feathers.
In summary:
* Same volume, different masses: Possible if the objects are made of different materials with different densities.
* Same mass, different volumes: Possible if the objects are made of the same material but have different shapes or sizes.
