Density ρ (Edexcel GCSE Physics): Flashcards

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3.1.1 Density
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Definition of density

Mass per unit volume

Formula for density

ρ=mV\rho = \frac{m}{V}

Symbol for density

ρ\rho (rho)

Units of density

kg/m3\text{kg/m}^3 (kilograms per metre cubed)

How to measure mass of an object

Use a balance

How to find volume of regular objects

Multiply the dimensions

How to find volume of irregular objects

Measure volume of liquid displaced

Equipment for measuring displaced liquid volume

Eureka can

Equipment for measuring volume of liquids

Measuring cylinder

Densities of solids vs liquids

Similar densities

Which usually has lower density: solid or liquid?

Liquids usually have lower density than solids

Main exception to solid/liquid density rule

Ice and water (water is denser than ice)

Density of gases compared to solids/liquids

Far lower density

What stays constant during state changes?

Mass

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