You may not even be aware of it but as you read this you are breathing in oxygen. You cannot see it but it is there. And a good job it is too because without it there would be no life on Earth. All living things, be they animal or plant, all need oxygen. Even fish and underwater plants. They take the dissolved oxygen in the water out and into their bodies.
Like natural gas or coal we use oxygen as a fuel. Just like a boiler in a home uses gas so do we with oxygen. Also just like a Boiler Service Cheltenham, Swindon, Tewkesbury, Cirencester or wherever it is we need a service, like https://www.hprservicesltd.com/cheltenham-boilers/boiler-service-cheltenham/ provide, as well.
Our use of oxygen is to “burn” the food we eat. This keeps our muscles working and the heart healthy. We breathe out carbon dioxide which is then taken by trees and turned back into oxygen again. Oxygen also allows us to have fire as it forms one of the three crucial elements of the fire triangle along with Fuel and heat. As with the Boiler, the fuel is the gas and the heat is the pilot light spark.