chapter  2
178 Pages


The world presently gets most o f its energy from crude oil and natural gas. Petroleum is the major source o f fuel used in transportation, manufacturing, and hom e heating.

Primary energy sources are defined as those coming from natural raw materials. The primary energy sources for the world during 1979 are reported [1] in Fig. 1. Oil and gas together furnished 65% of the total world energy usage for that year.