- Density is the measure of how close and how heavy are the particles of matter in an object. It is measured in kg/m3 or g/cm3 or g/mL.
- Rule for Density m
- Density = Mass / Volume
- Example of Density Rule
- Q. A stone has a mass of 10 grams. When it is immersed in a measuring cylinder of water, the water level rises 5 millilitres. What is the density of the stone?
- A. Density = mass / volume
- = 10 grams / 5 mL
- = 2 g/mL
- Densities of Some Common Substances
SUBSTANCE |
DENSITY (g/mL) |
| Air | 0.002 |
| Feathers | 0.045 |
| Petrol | 0.7 |
| Water | 1 |
| Aluminium | 2.7 |
| Lead | 11.3 |
- Floating and Sinking
The density of water is 1 g/mL. Any substance (such as ice, petrol or oil) whose density is less than 1 will float. Any substance (such as lead) whose density is more than 1 will sink.