what is fire?

[Melissa_dwl]

gas?

[wmissildine]

Rapid oxidation of combustible materials accompanied by a release of energy in the form of heat and light.

[Hamish]

I assume you mean what is a flame made from. A flame is a plasma - an ionized gas. Hamish

[gepisar]

When something burns, it is being oxidised. This causes an exothermic reaction, the by-product being heat (energy) This energy excites atoms and electrons. The electrons jump into a higher energy state, and at sometime later "cool" by releasing this higher state energy. This energy is given off as electomagnetic radiation, (infra-red [heat]) and normal light which you can see (yellow/red flame...) :-))