* Density: Density is a measure of how much mass is contained in a given volume. It's calculated by dividing the mass of an object by its volume: Density = Mass / Volume
* Tightly Packed Matter: When the particles of a substance are closer together (more tightly packed), there's more mass in a given volume.
Here's why this leads to greater density:
* More Mass in the Same Space: Imagine a box filled with ping pong balls. Now imagine the same box filled with marbles. The marbles are denser because they have more mass packed into the same space as the ping pong balls.
* Examples:
* Water vs. Ice: Water molecules are closer together in liquid water than in ice. This is why ice floats – it's less dense than water.
* Lead vs. Wood: Lead atoms are much denser than wood atoms, meaning a piece of lead will have more mass than a piece of wood of the same size.
In summary: A substance with more tightly packed matter will have a greater density because it has more mass concentrated within a given volume.
