* Density: Density is a measure of how much mass is packed into a given volume. A denser substance has more mass in the same amount of space.
* Buoyancy: Objects float when the buoyant force (the upward push from the fluid) is greater than the object's weight. This buoyant force depends on the density of the fluid.
Examples of substances that float in oil:
* Water: Water is denser than most oils, so it will sink.
* Cork: Cork is very light and less dense than oil, so it will float.
* Plastic: Some plastics are less dense than oil and will float.
* Wood: Many types of wood are less dense than oil and will float.
Note: The specific type of oil will affect what floats. For example, vegetable oil is less dense than mineral oil.
