research octane number
Oil Industry
noun
An octane number as determined by the research method of the American Society for Testing and Materials, used chiefly for low engine speeds and loads; abbreviated RON.
- The method involves running a fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of isooctane and n-heptane..
Origin
1940s; earliest use found in U.S. Patents.
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- orchid-colored