Floatation

investigating flotation for solids and liquids

relating flotation to density

OP3 investigate flotation for a variety of solids and liquids in water and other liquids,

and relate the results of this investigation to their densities

Try putting a cube of Ice in a glass of water, describe what happens. Now put another cube of Ice in Methylated Spirits what happens now?

Find the density of a coke can and diet coke can!

Place them in water.

A Density rainbow

A Varying density column

http://chemistry.about.com/od/chemistrydemonstrations/ht/rainbowinaglass.htm

http://scifun.chem.wisc.edu/homeexpts/layeredliquids.htm

Corn Syrup vs water vs oil

An aluminium cable is half the weight of a copper one with the same rating, so aluminium cables (reinforced with steel) are often preferred for hanging between overhead pylons.

A nice applet from Walter showing buoyancy !!

http://www.walter-fendt.de/ph14e/buoyforce.htm

A density lava lamp .... can you think what is happening ?

You can also use fizzy drinks

http://www.physics.org/interact/physics-to-go/lager-lamp/index.html