Density
Learning Objectives
- Students will be able to define density and calculate it using the formula ρ = m/V
- Students will be able to predict whether objects will float or sink based on relative densities
- Students will be able to explain how density varies with temperature and pressure
Core Concepts
- mass
- volume
- density
- buoyancy
- relative_density
Formulas
$$\rho = \frac{m}{V}$$
Density equals mass divided by volume
$$W = \rho V g$$
The weight of a substance in a gravitational field
Units
| kilogram per cubic meter | kg/m³ |
| gram per cubic centimeter | g/cm³ |
Interesting Fact
A teaspoon of neutron star material would weigh about 6 billion tons due to its extreme density
Key Scientist
Archimedes
Discovered the principle of buoyancy (Archimedes' Principle)
Modern Research
Materials science manipulates density through structure (foams, aerogels, composites); nuclear physics explores extreme densities of neutron stars.
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