[ahy-suh-byoo-teyn, -byoo-teyn]
noun Chemistry.
a colorless, flammable gas, C 4 H 10 , used as a fuel, as a refrigerant, and in the manufacture of gasoline by alkylation.

1875–80; iso- + butane Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The isobutane vaporizes at high pressures to drive a turbine.
Isobutane was not acutely toxic via the inhalation route and was basically non-irritating to the skin and eyes of rabbits.
The isobutane is recycled back into the reactor as feed.
For each run, a pre-blended feed of olefins and isobutane was introduced to the reactor.
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