Oxygen is essential in combustion procedures like the burning of fuels. All combustion reactions will also be examples of redox reactions. A combustion reaction happens each time a material reacts with oxygen to generate heat. 1 case in point may be the combustion of octane, the principle part of gasoline: https://oxygenchambercost38310.blogoxo.com/37118319/cost-of-oxygen-therapy-an-overview