Relative Density of Sink or Float

Density & Relative Density

Open Ended

Why does ice float on water?

Open Ended

If both balls in the image is dropped in water, which would float or sink? Give your reason.

What is density?

• The density of a substance is its mass per unit volume.

• The SI unit of density is kg/m³ or kg m^-3

• The density of an object will remain the same even if it you change size.

What is relative density?

• Relative density is the ratio of the density of a substance to the density of a given reference material (i.e., water).

• Relative density has no units since it is a ratio with the same units.

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Open Ended

Based on the information on the website, what are some importance of density?

Multiple Choice

Density is define as

• the mass per unit area

• the mass per unit volume

• the ratio of density of a substance to the water.

Multiple Choice

Relative Density is define as

• the mass per unit area

• the mass per unit volume

• the ratio of density of a substance to the density of water.

Multiple Choice

Can the relative density of a substance be zero?

• Yes

• No

Multiple Choice

Which is NOT an importance of density?

• Building boats

• identifying substances

• selecting foods

• identifying objects

Multiple Choice

Why a slice of bread is squeezed into a ball. Which quantity will not change?

• width

• volume

• density

• length

Multiple Choice

Which formula represents the relationship of density?

• mass x volume

• volume / mass

• mass + volume

• mass / volume

Multiple Choice

Which formula represents the relationship relative density?

• mass of substance / density of water

• density of substance / density of water

• mass of substance x density of water

• density of substance / mass of water

Multiple Choice

What is the SI unit of density?

• g/m³

• kg/cm³

• kg/m³

• kg/m²

Multiple Choice

What is the SI unit of relative density?

• g/m³

• kg/cm³

• kg/m³

• no units