Physics
Density Calculator
Calculate corrected density from mass, volume, and an entered factor; compare it with a reference density; and convert between density, specific volume, and mass per litre. The guide explains intensive properties, temperature and pressure dependence, bulk versus material density, and measurement consistency.
Calculated density-
Specific gravity-
Specific volume-
Mass per liter-
Decision view
Mass, occupied volume, and density
Mass, occupied volume, and densityThe sample mass and volume are shown as the two measured inputs; density, specific gravity, and specific volume remain distinct derived properties.
Exact scenario comparisonVolume (m3) changes while all other entered assumptions remain constant.
| Volume (m3) | Calculated density | Specific gravity | Specific volume | Mass per liter |
|---|
How to use Density Calculator
- Measure mass and volume for the same representative sample and enter them in kilograms and cubic metres.
- Use a correction factor only when its definition and direction are documented; otherwise leave it at 1.
- Compare calculated density with a compatible reference at the same temperature, pressure, composition, and material condition.
Calculator guide
Understanding Density Calculator
Density links measured mass to occupied volume. The calculator also expresses the result as specific gravity, specific volume, and mass per litre so unit or reference errors become easier to detect.
Calculation method
How the calculation works
Divide mass by volume, apply the entered correction factor, and compare the result with a reference density. Density ρ = (m/V) × correction factor. Specific gravity = ρ/ρref, specific volume = V/m, and kilograms per litre = ρ/1000.
Material interpretation
True, apparent, and bulk density are not interchangeable
The correct volume boundary depends on the question.
Record the measurement method with the result so later comparisons use the same density definition.
Worked situations
Practical examples
- A mass of 18 kg occupying 0.022 m³ has a density of about 818.18 kg/m³.
- Against a 1,000 kg/m³ reference, its specific gravity is about 0.818.
- The same density is approximately 0.818 kg/L, while specific volume is about 0.001222 m³/kg.
Better inputs
Useful tips
- Subtract container tare mass before entering sample mass.
- Use displaced volume cautiously when bubbles, wetting, absorption, or trapped voids are present.
- Distinguish true material density from bulk density that includes void space.
Before relying on the result
Limitations and common mistakes
- The entered correction factor is applied multiplicatively and is not a built-in temperature model.
- Compressibility, phase change, dissolved gas, porosity, moisture, and mixture composition are excluded.
- Measurement uncertainty can dominate the result when volume is small or irregular.
Reference
Key terms
- Density
- Mass per unit volume.
- Specific gravity
- Dimensionless density ratio to the entered reference.
- Specific volume
- Volume per unit mass, the reciprocal of density for consistent units.
- Bulk density
- Mass divided by external bulk volume, including inter-particle voids.
Important note
Calculated from the entered values using the displayed physical model. Confirm that its assumptions, units, boundary conditions, and safety limits match the application.
Frequently asked questions
Why does density change with temperature?
Mass usually changes little while thermal expansion changes volume.
Is specific gravity always referenced to water?
Often for liquids and solids, but this calculator uses whatever positive reference density is entered.
Can density identify a material?
It can narrow possibilities, but composition, porosity, temperature, and measurement error prevent unique identification.
What should the correction factor represent?
Only a documented multiplicative adjustment. Leave it at 1 if no validated correction is available.