Densidade é mass per unidade volume, calculated as ρ = m/V. It measures como much matter é packed into a given space. Water tem a density of 1 g/cm³ ou 1000 kg/m³. Materials denser than their surrounding fluid sink; menos dense materials float.

Understanding Densidade

Massa, Volume, e Buoyancy

Learn Sobre Densidade

Densidade explains por que a steel ship floats while a steel ball sinks, por que hot air rises, e por que oil floats on water. Este fundamental property connects mass e volume, determining como materials behave in o physical mundo.

Comuns Material Densities

Material	Densidade (g/cm³)	Densidade (kg/m³)
Air (sea level)	0.0012	1.2
Cork	0.24	240
Wood (oak)	0.6-0.9	600-900
Ice	0.92	920
Water	1.00	1000
Aluminum	2.7	2700
Iron	7.87	7870
Gold	19.3	19300

Por que Things Float ou Sink

Archimedes' Principle

An object floats if its density é menos than o fluid it's in:

Wood (0.7 g/cm³) floats in water (1.0 g/cm³)
Ice (0.92 g/cm³) floats in water
Oil (0.8-0.9 g/cm³) floats on water
Lead (11.3 g/cm³) sinks in water

Ships Float Because

Steel ships float because they enclose air, making their overall density menos than water.

Converter Densidade Unidades

Factors Affecting Densidade

Temperatura: A maioria materials expand quando heated, reducing density
Pressão: Gases compress significantly; solids e liquids much menos
Composition: Alloys e mixtures têm densities entre their components

Conclusão

Densidade—mass per unidade volume—é fundamental to understanding buoyancy, material properties, e physical behavior. Objects denser than their surrounding fluid sink; menos dense objects float. Este simples relationship explains phenomena from icebergs to hot air balloons.