The word we are looking at in this is probably called pyrolysis. There, pyrolysis is a reaction to chemical decomposition that involves ranging from low to very low oxygen, or at least the insufficient oxygen required for heating.

Generally, we can use two types of laboratory analytical instruments that burn samples. We use fire energy to produce H ₂ O and CO ₂ in bulk from organic compound samples where there is a lot of oxygen gas. Also, some metals work only through the process of pyrolysis instead of fire and form CO and H ₂ in large quantities from the same chemical samples of conditions in completely degraded conditions.