Density is the Key:
* Density is a measure of how much mass is packed into a given volume. It's calculated as: Density = Mass / Volume.
* Objects with the same mass can have different densities if they are made of different materials.
Examples:
1. A kilogram of feathers and a kilogram of iron: Both have the same mass (1 kilogram), but the feathers will take up a much larger volume than the iron. This is because feathers are less dense than iron.
2. A glass of water and a glass of oil: If you have equal volumes of water and oil, the water will be heavier because water is denser than oil. If you want to have equal masses of water and oil, you'll need a larger volume of oil.
Conclusion:
Mass and volume are related, but only through the concept of density. To know the volume of an object, you need to know its mass *and* its density.
