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**Density is… the amount of matter in a given area.**

Ex. population density (Alaska has 1 person/mi2, New Jersey has 1174 person/mi2)

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Density For science… density is equal to the mass of a thing divided by its volume. D = m/v Mass – amount of matter – measured in grams (g) Volume – amount of space something occupies – measured in cm3 or mL Mass = D(v) v = m/d

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**Volume For regularly shaped objects- l x w x h ~ (cm)x (cm)x (cm)=cm3**

For irregularly shaped objects- use displacement (amount of water pushed aside equals the volume of the object)

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**Archimedes Principle Archimedes- Greek philosopher**

Was in his bath tub one morning – he noticed that as his body went in to the water – the water rose out of the way. He realized that the volume of H2O that rose was equal to the volume of his body. So… the volume of an object is equal to the volume of H2O it displaces! 1g H2O = 1mL H2O = 1 cm3 H2O

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**Buoyancy -upward force that keeps things afloat.**

So why do things float? Buoyancy -upward force that keeps things afloat. -in water: an object floats if its buoyancy is greater than its weight; sinks if its weight is greater than its buoyancy -the buoyant force on the solid object is equal to the weight of the water displaced

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**What’s that glass bubble thing on your desk?**

It’s a Galileo thermometer? Glass bubbles of colored water with metal tags attached Each tag has a slightly different mass

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Practice time If an object has a density <1g/cm3, what will it do if placed in water? If an object has a density >1g/cm3, what will it do if placed in water? If an object has a density =1g/cm3, what will it do if placed in water?

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