They are used as fuels in internal combustion engines, as they vaporize easily on entry into the combustion chamber without forming droplets, which would impair the uniformity of the combustion.
ðeɪ ɑːɹ jˈuːzd æz fjˈuːəlz ɪn ɪntˈɜːnəl kəmbˈʌstʃən ˈɛndʒɪnz, æz ðeɪ vˈeɪpɚɹˌaɪz ˈiːzili ˌɔn ˈɛntɹi ˌɪntʊ ðə kəmbˈʌstʃən tʃˈeɪmbɚ wɪðˌaʊt fˈɔːɹmɪŋ dɹˈɑːplɪts, wˌɪtʃ wʊd ɪmpˈɛɹ ðə jˌuːnɪfˈoːɹmᵻɾi ʌvðə kəmbˈʌstʃən.