Barrel (unit) continued to use the same size barrels. In the worldwide oil industry, an oil barrel is defined as 42 US gallons, which is about litres or 35 imperial gallons. Oil companies that are listed on American stock exchanges typically report their production in terms of volume and use the units of bbl, Mbbl (one thousand barrels), or MMbbl (one million barrels) and occasionally for widest comprehensive statistics the Gbbl (or sometimes Gbl) denoting a billion. There is a conflict concerning the units for oil barrels (see ). For all other physical quantities, according to the International System of Units, the
History of oil in California through 1930 the west coast of both Americas." During this same period, California’s agriculture and manufacturing markets were also expanding rapidly, and the increased oil production helped to power the development of these industries. However, the development of increased oil production in California had consequences. The additional California oil fields—along with booming oil supplies in Texas from Spindletop—resulted in another surplus of oil reaching the market, again impacting the price of the commodity. With the accelerated oil drillings, the price of oil in the 1920s fell from $28 per barrel to below $10 per barrel. The issue became an increasingly debated topic