What is DENSITY??

A Golf Ball is MORE DENSE than a Ping Pong Ball

What does this mean?

The ______________ of like atoms or The ______________ of like atoms or moleculesmolecules

More than just the _____________of a More than just the _____________of a substance, density includes substance, density includes _________________ an object takes up!!_________________ an object takes up!!

All substances have density including All substances have density including liquids, solids, and gasesliquids, solids, and gases

Density is the measure of the Density is the measure of the _______________ of a material_______________ of a material

DENSITY DENSITY

Depends on:Depends on: Mass: ______________________Mass: ______________________ Volume: ___________________________________Volume: ___________________________________

FORMULA: __________________FORMULA: __________________

Mass usually expressed in ________Mass usually expressed in ________

Volume usually expressed in _____Volume usually expressed in _____ or or liters, etc.liters, etc.

What would take up more space??? What would take up more space??? A kilogram of feathers….. A kilogram of feathers…..

or a kilogram of steel??or a kilogram of steel??

OR

““Compactness”Compactness”

LIQUIDSLIQUIDS The more dissolved solids in a The more dissolved solids in a

solution, the __________________ (such solution, the __________________ (such as ocean water)as ocean water)

Cold water in lakes tend to ______ Cold water in lakes tend to ______ (this creates a constant mixing of (this creates a constant mixing of water, nutrients, and other water, nutrients, and other substances)substances)

Denser layers to less dense layers…..

What would happen????What would happen????

Mercury density = 13600kg/mMercury density = 13600kg/m3 3

Lead density = 11340kg/mLead density = 11340kg/m33

Lead floats on liquid mercury!Lead floats on liquid mercury!

SolidsSolids

Ice vs. water…..

SOLIDSSOLIDS

Ice is _____________ than water (which Ice is _____________ than water (which is why lakes and ponds have a thin is why lakes and ponds have a thin layer of ice covering in winter, with layer of ice covering in winter, with water underneath)water underneath)

Various rocks, woods, metals have a Various rocks, woods, metals have a characteristic density specific to that characteristic density specific to that substancesubstance

Wouldn’t you like to have a bunch of THIS dense material?

Factors affecting DensityFactors affecting Density

________________________________________

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DETERMINING DENSITYDETERMINING DENSITY Regular Shapes – mass, then Regular Shapes – mass, then

determine the volume by formuladetermine the volume by formulaEX: cubes, cylinders, spheres, EX: cubes, cylinders, spheres,

cones, cones, etc.etc. Irregular shapes – mass, then Irregular shapes – mass, then

measure displacement of a liquid measure displacement of a liquid (usually water) by that irregularly (usually water) by that irregularly shaped objectshaped object