Plastic Toy Complete
The complete plastic toy. Half filled with Baby Oil and the ohter half filled with water. CLICK TO SEE A 120Kb MOVIE OF THE COMPLETE TOY.

Step 4 Half fill the toy with clear Baby Oil and the other half with coloured water. Screw the cap back on tightly.

It is probably wise to fill the entire toy with water first and test for any leaks before the oil is placed into the toy.
The bubbles of oil are large and break easily. The do not last for long.,The b ubbles of water are smaller and last longer than the bubbles of oil.

Questions and report.

Research the following words
- surface energy
- surface tension
- immiscible liquids.
- surfactant
- density
- buoyancy
- upthrust

1) Do oil and water have the same surface tension? Explain.

2) Why are the bubbles of water floating in the oil smaller than the bubbles of oil floating in the water(as seen in the pictures above)?
3)Why do the bubbles of water last a longer time than the bubbles of oil?
4) Explain how we can make oil and water mix together?
5) Explain how soap works? (you can animate the action of soap in Flash or some other animation program)
6) Explain where, in the construction of the Plastic Toy, a thermoplastic and a thermosetting plastic were used. Describe the difference between the two types of plastics and explain how each one sets.
7) What type of moulding is used to produce the tubes and screw-on tops. What type of plastic is used to make the tubes and tops.
8) Using the words you have researched above explain how the Plastic Toy works.

Go back to step 3