Density
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Density is a property that describes how much mass is contained within a certain volume, and is calculated by dividing an object's mass by its volume. It varies between substances, with water being denser than oil, Styrofoam less dense than ceramic, wood floating but rocks sinking due to their higher density than water, and helium balloons rising because helium is less dense than air. Knowing an object or substance's density can help predict if it will float or sink.
Density
- 2. Density is a property of matter that is unique to each substance. It is a measure of the mass of the substance in a standard unit of volume.
- 3. Formula The only way to decide the density of a substance is to measure its mass and its volume, then divide. Density = Mass ÷Volume Units for density g/cm3
- 4. •Oil and water - In an oil spill in the ocean, the oil rises to the top because it is less dense than water. •A Styrofoam cup is less dense than a ceramic cup, so the Styrofoam cup will float in water and the ceramic cup will sink. •A piece of wood will float on water; but, most rocks are more dense than water, so they will sink. •Helium is less dense than air, so helium balloons rise. •Oil floats on vinegar because its density is less. •When adding motor oil to your car, you need to know the recommended density.