Materials Required:
l Candle
l Aluminium pie tin
l Coin
l Index card
l Matches
The help of one of your parents
Procedure:
- Set the candle on the aluminium pie tin and place the tin in the sink.
- Rest the coin in the center of the index card.
- Ask one of your parents to light the candle and move the card over the tip of the flame, keeping the card in continuous motion, but the coin in the same position. When the paper begins to turn brown, ask your parent to stop.
- Let the coin slide off the card into the aluminium dish. The coin will be hot, so do not pick it up until it has cooled. You will see a pattern on the card in the spot where the coin was resting.
This Is What Happens:
The change in colour of the paper is due to the heat from the candle flame. A slight, charring takes place. The area where the coin is resting, however, remains unburned because the metal conducts heat away from that space.
