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.
The term diesel fuel is most often used when referring to fuel for diesel engines. The term fuel oil is most often used when referring to fuel used for heating purposes. For example, diesel fuel no. 2 and fuel oil no. 2 are very similar in physical and chemical respects. The main differences between diesel fuel no. 2 and fuel oil no. 2 are the intended use of the two petroleum products and the additives that are added to each product for the particular use.