Density Calculator
Mass ÷ Volume Calculator
Density
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Understanding Density
Density describes how tightly packed the mass of a substance is within a given volume, calculated simply as Density = Mass ÷ Volume. It's one of the most useful properties in materials science, engineering, and everyday problem solving, from identifying an unknown metal to figuring out if an object will float.
Water as the Baseline
Water has a density of exactly 1 g/cm³ (1,000 kg/m³) at 4°C. Anything less dense than water floats; anything denser sinks — this is the basis of specific gravity.
Density Changes with Temperature
Most materials expand and become less dense as they heat up. Gas densities in particular are extremely sensitive to both temperature and pressure.
Common Reference Densities
Air: ~1.2 kg/m³ | Water: 1,000 kg/m³ | Aluminum: ~2,700 kg/m³ | Steel: ~7,850 kg/m³ | Gold: ~19,300 kg/m³
Identify Unknown Materials
Comparing a calculated density against known reference values is a classic way to identify an unlabeled metal or material.
Key Takeaways
- Consistent Units: Make sure mass and volume are measured for the exact same sample — mixing units for different objects gives a meaningless result.
- Irregular Shapes: For irregular objects, measure volume by water displacement rather than trying to calculate geometric volume.
- Not the Same as Weight: Density is an intrinsic property of a material, unlike total weight, which depends on the size of the sample.