1. 1. To understand how density To understand how density applies to some everyday applies to some everyday situations situations 2. 2. To look at floating & To look at floating & sinking with respect to sinking with respect to density density 3. 3. To conduct a brief To conduct a brief investigation into density investigation into density Book Book Reference : Reference : Pages 162-163 Pages 162-163

1.To understand how density applies to some everyday situations 2.To look at floating & sinking with respect to density 3.To conduct a brief investigation

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Page 1: 1.To understand how density applies to some everyday situations 2.To look at floating & sinking with respect to density 3.To conduct a brief investigation

1.1. To understand how density applies to To understand how density applies to some everyday situationssome everyday situations

2.2. To look at floating & sinking with respect To look at floating & sinking with respect to densityto density

3.3. To conduct a brief investigation into To conduct a brief investigation into densitydensity

Book Reference :Book Reference :Pages 162-163Pages 162-163

Page 2: 1.To understand how density applies to some everyday situations 2.To look at floating & sinking with respect to density 3.To conduct a brief investigation

Anyone like to guess what the density of Anyone like to guess what the density of water is?water is?

Page 3: 1.To understand how density applies to some everyday situations 2.To look at floating & sinking with respect to density 3.To conduct a brief investigation

1 litre of water weighs 1kg (at 4°C)1 litre of water weighs 1kg (at 4°C)

Since 1 litre is 1/1000Since 1 litre is 1/1000thth m m33 this means that this means that the density of water is 1g/cmthe density of water is 1g/cm33 or 1000kg/m or 1000kg/m33

•What happens to objects with a lower What happens to objects with a lower density in water?density in water?

•What happens to objects with a higher What happens to objects with a higher density in water?density in water?

Page 4: 1.To understand how density applies to some everyday situations 2.To look at floating & sinking with respect to density 3.To conduct a brief investigation

Objects less dense than water float....Objects less dense than water float....

Objects which are more dense that water Objects which are more dense that water sinksink

So why does Ice float then?So why does Ice float then?

Page 5: 1.To understand how density applies to some everyday situations 2.To look at floating & sinking with respect to density 3.To conduct a brief investigation

As water freezes and turns to ice it As water freezes and turns to ice it expands... expands...

Expansion means an increase in volume Expansion means an increase in volume while keeping the mass of water the samewhile keeping the mass of water the same

Hence the density of ice is less than that of Hence the density of ice is less than that of water and so Ice floatswater and so Ice floats

Page 6: 1.To understand how density applies to some everyday situations 2.To look at floating & sinking with respect to density 3.To conduct a brief investigation

water water 1000 kg/m1000 kg/m33 (1.00 g/cm(1.00 g/cm33))aluminium aluminium 2700 kg/m2700 kg/m33 (2.70 g/cm(2.70 g/cm33))zinc zinc 7130 kg/m7130 kg/m33 (7.13 g/cm(7.13 g/cm33))iron iron 7870 kg/m7870 kg/m33 (7.87 g/cm(7.87 g/cm33))copper copper 8960 kg/m8960 kg/m33 (8.96 g/cm(8.96 g/cm33))silver silver 10,490 kg/m10,490 kg/m33 (10.49 g/cm(10.49 g/cm33))lead lead 11,360 kg/m11,360 kg/m33 (11.36 g/cm(11.36 g/cm33))mercury mercury 13,550 kg/m13,550 kg/m33 (13.55 g/cm(13.55 g/cm33))gold gold 19,320 kg/m19,320 kg/m33 (19.32(19.32 g/cm g/cm33))