Here's the breakdown:
* Density is a measure of how much mass is packed into a given volume. Think of it as how "heavy" something is for its size.
* Water has a density of about 1 gram per cubic centimeter (g/cm³).
* Objects denser than water (over 1 g/cm³) will sink. This is because they are heavier than the same volume of water, so gravity pulls them down.
* Objects less dense than water (under 1 g/cm³) will float. They are lighter than the same volume of water, so water pushes them up with a force called buoyancy.
Here are some examples:
* A rock is very dense and sinks.
* A piece of wood is less dense than water and floats.
* A steel ship is made of dense metal, but its shape creates a large volume that displaces enough water to make it less dense than water, allowing it to float.
Important things to remember:
* Shape matters! Even dense objects can float if their shape allows them to displace enough water. This is how ships work.
* Temperature affects density. Cold water is denser than warm water, which is why ice floats.
Let me know if you have any other questions!
