Reference Terms
from Wikipedia, the free encyclopedia
Ethanol fuel
The use of ethanol as a fuel for internal combustion engines, either alone or in combination with other fuels, has been given much attention mostly because of its possible environmental and long-term economical advantages over fossil fuel. Ethanol fuel is an alternative to gasoline. It can be combined with gasoline in any concentration up to pure ethanol (E100). Anhydrous ethanol, that is, ethanol without water, can be blended with gasoline in varying quantities to reduce the consumption of petroleum fuels, as well as to reduce air pollution. In the US, tolerance of ethanol depends on the individual vehicle.
In Brazil, ethanol-powered and flexible-fuel vehicles are capable of running on hydrated ethanol, an azeotrope of ethanol and water. In addition, flexible-fuel vehicles can run on any mixture of hydrated ethanol and gasoline, as long as there is at least 20% ethanol. A few flexible-fuel systems, like the Hi-Flex, used by Renault and Fiat, can also run with pure gasoline.
Ethanol is increasingly used as an oxygenate additive for standard gasoline, as a replacement for methyl t-butyl ether (MTBE), the latter chemical being responsible for considerable groundwater and soil contamination. Ethanol can also be used to power fuel cells and to produce biodiesel.
Related Stories
1
2
Earth & Climate News
April 19, 2026
Apr. 19, 2026 Human societies didn’t just adapt to the planet—they learned to reshape it. From early fire use to today’s global supply chains, our cultural and social innovations have unlocked extraordinary power to transform Earth and improve human life. ...
Apr. 19, 2026 Scientists have developed a fuel cell that uses microbes in soil to produce electricity. The device can power underground sensors for tasks like monitoring moisture or detecting touch, without needing batteries or solar panels. It works in both dry ...
Apr. 18, 2026 That “magic” sponge under your sink may be hiding an environmental downside. While melamine sponges are famous for effortlessly scrubbing away stubborn stains, they slowly break down as you use them—shedding tiny plastic fibers that wash into ...
Apr. 18, 2026 Scientists drilling deep beneath Greenland’s ice have uncovered a startling clue about its past—and future. Evidence shows that the Prudhoe Dome, a major high point of the ice sheet, completely melted around 7,000 years ago during a relatively ...
Apr. 17, 2026 Long before rising seas swallowed Doggerland beneath the North Sea, this lost landscape may have been a surprisingly lush and life-friendly haven. New DNA evidence reveals that forests of oak, elm, and hazel were already thriving there more than ...
Apr. 17, 2026 A hidden threat is emerging in the world’s glaciers: while most are shrinking, a rare group known as “surging glaciers” can suddenly accelerate, unleashing powerful and sometimes destructive ...
Apr. 16, 2026 The ozone layer has been on track to recover thanks to the Montreal Protocol—but a loophole may be holding it back. Chemicals still permitted for industrial use are leaking into the atmosphere at higher rates than expected. Scientists now estimate ...
Apr. 16, 2026 Researchers have discovered lithium hidden in pyrite within ancient shale rocks—an unexpected find that could reshape how we source this critical battery material. It raises the possibility of extracting lithium from existing waste, reducing the ...
Apr. 16, 2026 Scientists have discovered that methane in the open ocean is produced by microbes under nutrient-poor conditions, solving a long-standing mystery. As warming oceans reduce nutrient mixing, these ...
Apr. 14, 2026 For years, water managers have been puzzled as the Colorado River kept delivering less water than expected—even when snowpack levels looked promising. New research reveals the missing piece: spring rain, or rather, the lack of it. Warmer, drier ...
Apr. 13, 2026 Africa’s forests have undergone a shocking reversal, switching from carbon absorbers to carbon emitters after 2010. Researchers found that heavy deforestation in tropical regions has led to massive biomass losses, far outweighing any gains from ...
Apr. 13, 2026 Gray whales are beginning to break their long-established migration patterns, venturing into risky new territory like San Francisco Bay as climate change disrupts their Arctic food supply. But this unexpected detour is proving deadly: nearly one in ...
Latest Headlines
updated 12:56 pm ET
Apr. 18, 2026 As the Moon swallowed the Sun during the April 8, 2024, total solar eclipse, something remarkable happened on the ground—cities went eerily quiet. Scientists analyzing seismic data found that ...
Apr. 11, 2026 Scientists searching for air pollution clues stumbled onto something unexpected: toxic MCCPs drifting through the air for the first time in the Western Hemisphere. The likely source—fertilizer made ...
Apr. 7, 2026 A colossal ocean current encircling Antarctica—stronger than all the world’s rivers combined—played a far more complex role in shaping Earth’s climate than scientists once thought. New ...
Apr. 6, 2026 A remarkable fossil discovery in southwest China is rewriting the story of how complex animal life began, showing that many key animal groups appeared millions of years earlier than scientists once ...
Apr. 6, 2026 Oyster reefs aren’t random piles—they’re carefully shaped survival systems. Researchers discovered that certain geometric patterns, not just bigger or more complex structures, give young ...
Apr. 4, 2026 A sweeping new study reveals that as Arctic permafrost thaws, it is dramatically reshaping rivers and releasing vast amounts of ancient carbon that had been locked away for thousands of years. By ...
Apr. 4, 2026 Warming across the U.S. is far more uneven than it looks at first glance. While only about half of states show rising average temperatures, most are heating up in specific ways—like hotter highs or ...
Apr. 4, 2026 Asteroid impacts may have helped kick-start life on Earth by creating hot, chemical-rich environments ideal for early biology. These impact-generated hydrothermal systems could have lasted thousands ...
Apr. 3, 2026 Saturn’s magnetic field isn’t the smooth, symmetrical shield scientists see around Earth. Instead, it’s noticeably skewed, and researchers now think they understand why. By analyzing years of ...
Apr. 2, 2026 Hundreds of millions of years ago, Earth’s magnetic field behaved in a way that has long baffled scientists, showing wild and seemingly chaotic ...