Weird physical phenomena
The laws of physics can create some strange surprises. Here are our favourites.
1. The Leidenfrost Effect (video)
The Leidenfrost effect explains why water sometimes 'rolls' off a hot plate or frying pan, and how some experts can dip their hands into liquid nitrogen or even molten lead without hurting themselves
2. The Brazil Nut Effect
Why do raisins always rise to the top of cereal pack? It's the Brazil nut effect.
3. The Mpemba Effect
The Mpemba Effect is a bizarre phenomenon where hot water freezes faster than cold water. This site gives a basic introduction to the ideas involved.
4. The Hot Chocolate Effect
If you stir a freshly poured cup of instant coffee or hot chocolate, the sound of your spoon clinking against the side of the cup rises in pitch. Why?
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