isooctane

American

[ahy-soh-ok-teyn] / ˌaɪ soʊˈɒk teɪn /

noun

Chemistry.

the octane C 8 H 18 , used as one of the standards in establishing the octane number of a fuel.

isooctane British

/ ˌaɪsəʊˈɒkteɪn /

noun

a colourless liquid alkane hydrocarbon produced from petroleum and used in standardizing petrol. Formula: (CH 3 ) 3 CCH 2 CH(CH 3 ) 2 See also octane number

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of isooctane

First recorded in 1905–10; iso- + octane

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Isobutylene is used in the production of isooctane, a component of some gasolines.

From New York Times • Feb. 15, 2023

The numbers on the pump, usually in the 80s and 90s, are simply the octane rating, or the percentage of the isooctane in the mixture.

From Seattle Times • Aug. 16, 2021

At 34.0 °C, the vapor pressure of isooctane is 10.0 kPa, and at 98.8 °C, its vapor pressure is 100.0 kPa.

From Textbooks • Feb. 14, 2019

How many moles of isooctane must be burned to produce 100 kJ of heat under standard state conditions?

From Textbooks • Feb. 14, 2019

Numerical rating was arrived at by noting the number of parts of non- knocking isooctane which must be added 1 to ten parts of heptane to duplicate exactly the fuel being rated.

From Time Magazine Archive

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023