This marks 100 years of continuous weather records for Phoenix. The assistance given by Mr. Robert S. Ingram, former Meteorologist in Charge, National Weather Service Office, Phoenix, Arizona, Mr. Paul C. Kangieser, former NOAA Climatologist for Arizona, and other staff members is gratefully acknowledged.
Most liquid fuels in widespread use are derived from the fossilized remains of dead plants and animals by exposure to heat and pressure in the Earth's crust. However, there are several types, such as hydrogen fuel (for automotive uses), ethanol, jet fuel and biodiesel which are all categorized as a liquid fuel.
There are two different types of fuels can be used in combustion systems: liquids or solids. 1  Combustion of a liquid fuel in an oxidizing atmosphere actually happens in the gas phase. 2  Solid fuels need three separate phases:  Preheating phase, when the unburned fuel is heated up to its flash point and then fire point.