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Complexity level:
6
Project cost ($):
30
Time required:
15 minutes preparation time, 15 minutes to observe
Material availability:
Polypropylene pads should be available at hardware shops. If not, students can purchase it in bulk from the supplier. Detergents are available in almost supermarket. Engine oil is available at nearby petrol kiosks and in some supermarkets/hardware stores.
Safety concerns:

Teacher supervision required. Beware of highly flammable oils. Gloves and safety goggles should be worn at all times for safety reasons.