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

The combustion of 1.00 L of isooctane produces 33,100 kJ of heat.

From Textbooks • Feb. 14, 2019

But isooctane alone makes a poor fuel because it is not volatile enough, does not readily carburet into explodible vapor.

From Time Magazine Archive

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