Propane and butane are gases at atmospheric pressure that can be liquefied at fairly low pressures and are commonly known as liquified petroleum gas (LPG).
pɹˈoʊpeɪn ænd bjˈuːteɪn ɑːɹ ɡˈæsᵻz æɾ ˌætməsfˈɛɹɪk pɹˈɛʃɚ ðæt kæn biː lˈɪkwɪfˌaɪd æt fˈɛɹli lˈoʊ pɹˈɛʃɚz ænd ɑːɹ kˈɑːmənli nˈoʊn æz lˈɪkwᵻfˌaɪd pətɹˈoʊliːəm ɡˈæs ˌɛlpˌiːdʒˈiː.