Fuels contain heat energy that is released when fuel is burned. The controlled process of burning fuel is referred to as combustion.
The following eight questions are related to the basics of combustion as applied to gas heating.
Questions taken from Gas Heating, by Jason Obrzut, CMHE, copyright ESCO Institute, Mount Prospect, IL, 60056. www.escogroup.org / 800-726-9696. Used by permission.