The term "Thermite" refers to the mixture of aluminum and ferric oxide used in this experiment. It is sold commercially and is used for such applications as railroad welding and incendiary bombs.
Rust and aluminum are combined and ignited with a magnesium ribbon. Molten iron is produced and lots of energy is released.
This demonstration produces heat at above 2800F or 1500C.
Fe2O3 + 2 Al --> Al2O3 + 2 Fe
SAFETY - This is an extremely DANGEROUS reaction and should only be done by trained professionals. Since YOU are not a trained professional DON'T try it.