What does AA mean in BRITISH DEGREE
AA stands for Antique Antiknock. It is a type of gasoline additive that was commonly used in the early 20th century to improve the performance of internal combustion engines.
AA meaning in British Degree in Academic & Science
AA mostly used in an acronym British Degree in Category Academic & Science that means Antique Antiknock
Shorthand: AA,
Full Form: Antique Antiknock
For more information of "Antique Antiknock", see the section below.
Definition
AA is a mixture of tetraethyllead and ethylene dibromide. Tetraethyllead is an organolead compound that acts as an antiknock agent, while ethylene dibromide is a scavenger that prevents the formation of lead deposits in the engine.
History
AA was first developed in the 1920s by the Standard Oil Company of New Jersey (now ExxonMobil). It was quickly adopted by the automotive industry as a way to reduce engine knocking and improve fuel efficiency. However, AA was later found to be harmful to human health and the environment, and its use was gradually phased out in the 1970s.
Uses
AA was used as an antiknock additive in gasoline for decades. It was particularly effective in high-compression engines, which are more prone to knocking. AA also helped to reduce engine wear and tear and improve fuel economy.
Safety Concerns
AA is a toxic substance that can cause a variety of health problems, including:
- Lead poisoning
- Kidney damage
- Nervous system damage
- Cancer
AA is also harmful to the environment. It can contaminate soil and water, and can be toxic to wildlife.
Phase-Out
Due to its safety concerns, AA was gradually phased out of use in the 1970s. It was replaced by other antiknock additives, such as methyl tert-butyl ether (MTBE) and ethanol.
Final Words: AA was an important gasoline additive in the early 20th century. However, its use was eventually discontinued due to its harmful effects on human health and the environment. Today, AA is no longer used in gasoline.
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