Energy Fluid Revolution

Japanese: エネルギー流体革命 - えねるぎーりゅうたいかくめい

…Oil appeared at the beginning of the 20th century, and gradually replaced coal demand due to its advantages as a fluid energy source. However, the market expanded especially after World War II, triggered by the discovery of large oil fields in the Middle East. In 1960, coal's share of primary energy supply fell to 50%, and the so-called "energy fluid revolution" continued to progress, and as of 1983, it had fallen to 30%. For this reason, after World War II, the rationalization of coal mining became a major issue in many countries. …

From the Oil Industry

…As a result, the ratio of solid fuels (coal and lignite) to liquid fuels (oil), which was 46:36 in 1963, reversed around 1967, and by 1975 it was 33:44. This was the so-called "energy fluid revolution." However, after the first oil crisis in 1973, the demand for oil, which had been growing rapidly, began to stagnate. …

*Some of the terminology used in relation to the "Energy Fluid Revolution" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…石油は，20世紀に入ってから登場し，流体エネルギーとしての優位性から，漸次石炭需要を代替していたが，中東での大油田の発見などを契機として，とくに第2次大戦後に市場を拡大した。1960年には，一次エネルギー供給に占める石炭の割合は50％に落ち，さらにその後もいわゆる〈エネルギー流体革命(エネルギー革命)〉は進行して，83年現在で30％に低下している。このため，第2次大戦後，各国で石炭鉱業の合理化が大きな課題となった。…