A Trick of Heat
You will need: A quarter (or other coin), handkerchief, wooden skewer or pencil.
Tell your friends that you can hold a piece of burning wood to a handkerchief without scorching or burning the cloth.
(If your mother is not too anxious to see this experiment performed with a good linen handkerchief, let her find you an old piece of linen from her rag bag.)
Place a quarter in the center of the handkerchief and fold the cloth over the coin, twisting the ends together so that the handkerchief is drawn tightly across the face of the coin.
Now place the end of a pencil in the flame of a candle until the wood is glowing red. Press the end of the smoldering wood for 10 seconds against the handkerchief. When the pencil is removed and any loose ash blown away from the cloth there will be no sign of scorching.
This is because the metal coin is such a good
conductor of heat that it carries the heat from the end of the smoldering wood
right through the handkerchief with such speed that it has no time to scorch