Definition of isobutane in US English:

noun

• A gaseous hydrocarbon isomeric with butane.

  Chemical formula: CH₃CH(CH₃)₂

  Example sentences

  • ‘Residents are exposed to photochemical smog, airborne particles, and alkane hydrocarbons (e.g., propane, isobutane, n-butane).’
  • ‘The end result is the addition of isobutane to isobutylene to form isooctane, the molecule that is the basis of octane ratings seen at the gas pumps.’
  • ‘The reformulated product contained isobutane [2.76], ethyl acetate [0.73], n-heptane [4.66], and fluoroaliphatics [0.75].’
  • ‘According to the company's information the fuel of choice is an 80/20 isobutane / propane mixture.’
  • ‘And so, Kelley knew just what to do as 128.3 tons of vaporized poisons - including sulfur dioxide, hexane, carbon monoxide, isobutane - began sifting earthward.’