Density Calculator
Calculate relationships between mass, volume and density.
ρ = m / V = 100 / 100
상세 결과
참고: 주요 물질 밀도
Overview
Calculate density, mass, or volume from the other two values using the relationship ρ = m/V. Used in material identification, buoyancy calculations, material engineering, and chemistry.
Formula
Density = Mass ÷ Volume (ρ = m / V) Mass = Density × Volume (m = ρ × V) Volume = Mass ÷ Density (V = m / ρ) Units: Density (kg/m³, g/cm³), Mass (kg, g), Volume (m³, cm³, L)
How to Use
- 1Select the value to calculate (density, mass, or volume).
- 2Enter the other two known values.
- 3Choose the appropriate units (kg/m³ or g/cm³, etc.).
- 4View the calculation result.
Tips
- ✔Water has a density of approximately 1,000 kg/m³ (1 g/cm³) at 4°C.
- ✔Objects less dense than water float; denser objects sink.
- ✔1 g/cm³ = 1,000 kg/m³.
- ✔Most materials expand and decrease in density as temperature rises (water between 0–4°C is an exception).
FAQ
Q. What is the difference between density and specific gravity?
Density is mass per unit volume (kg/m³), while specific gravity is the ratio of a substance's density to water's density and is dimensionless. A specific gravity greater than 1 means the substance is denser than water.
Q. Why is water densest at 4°C?
Due to hydrogen bonding in water molecules. Below 4°C, hydrogen bonds form an open structure increasing volume, and above 4°C, thermal expansion increases volume. Thus, density is maximum at 4°C.
Q. How do metal densities compare?
Aluminum ~2,700 kg/m³, iron ~7,874 kg/m³, copper ~8,960 kg/m³, gold ~19,300 kg/m³. These significant differences allow material identification by density measurement.
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